|Alternate Names||Gloomy Big Guy (By Aiji)|
|Family||Ritsuko Kurashina (mother)|
|Occupation||Founder and Administrator of "Black Aquarium" (Second Season)|
|First Apperance||Chapter 14|
"The connections made on social can be as strong as those of blood."
– Mizuki Kurashina, Chapter 53
Mizuki Kurashina (蔵科 ミズキ, Kurashina Mizuki) is one of the antagonists in the first half of second part of the story, one of male protagonists in second half of the second part and third part of the story. He become Yuuma Mukai's friends and followers in the later story.
Mizuki has a very deranged personality, and is also an admin of a suicide website, Black Aquarium. Murder and death is not something that he fears.
In depth, Mizuki is mentally unstable and while not as malicious as he was before, psychotic. He seems to enjoy inflicting pain on both himself and others, making him a sadomasochist. He seems to be very obsessive and oddly childish as well, usually seen sulking whenever he doesn't get what he wants.
He has an unhealthy obsession with his mom and seems to enjoy getting spoiled with love and affection (specifically he enjoys hugs and comfort) as he hasn't gotten any after his mom's death.
Although as the story progresses, Mizuki seems to grow out of his obsession with his mom (although not quite), and have a easier time controlling his outbursts. Although he still loves violence.
He's very pushy and quite clingy if seen into. He usually acts without thinking.
While mentally unstable, he's quite brilliant in the brain and has tactical, methodical fighting skills along with a keen cleverness when outsmarting people
Mizuki lived with his mother, Ritsuko Kurashina during his childhood. One day, Mizuki saw his mother commit suicide in her room and saw the storybook named Country of Despair. Mizuki believed his mother didn't die but her soul was living in the Country of Despair and waiting for Mizuki to come with her, he soon tried killing himself so he could go to the Country of Despair with his mother, but soon he realized that he didn't have any despair yet. As such, Mizuki started to take a lot of photos about despair as his "tickets" so he can be able to go to the Country of Despair. Mizuki's mother dead face was his very first photo of his Despair collection.
Chapter 11-70 (Second Season)EditMizuki first appeared in Chapter 14, during the Real Live Game which he joined with another player, in the transmission he tried to kill and torture his partner to gain a lot of views, which Yuuma Mukai could see through his stream. Later, during the Read & Ignore Eradication Misure game he comes to see Yuuma, greeting him and asking him if he would like to eat his raw meat but Yuuma rejects him, then he leaves the slot-machine area and tells Yuuma that he's a boy. A day later, three players requested Mizuki to kill them so they can be freed from the feeling despair, to which he accepted the request. Then Mizuki brought the three players to another area, which Yuuma happened to walk by. When Chiho Fujimaki is nearly killed by Mizuki, he is stopped by Yuuma. Chiho starts crying and Mizuki thinks her crying expression are good so he takes a photo and puts it into his despair collection. After Yuuma notes Mizuki is crazy, he stopped Yuuma from replying to the message, it leaves Yuuma terrified because he would die soon because of it. Suddenly, Mizuki stopped his actions and let Yuuma stay alive and said that he is not the "best prey". Mizuki gives Yuuma's crying photo back to him as the photo is too lame and not good enough for his despair collection.
While Yuuma finally gets the No. 45 stamp and uses it, Mizuki steals Yuuma's stamp and deletes it. Yuuma asks him why Mizuki did it, to which he replies in this way the players will feel even more despair and become part of his despair collection. Mizuki also becomes interested to see how Yuuma's face would look like when he feels despair, however Yuuma remains calm which makes him wonder why he still hasn't feel despair yet, he said it's impossible to change the situation. After Yuuma ended the game with killing Marble, Mizuki realized that Yuuma is the "best prey" that he wanted for a long time, he swears that he must get Yuuma's despair photo and kill him.
A few days later, the Big Flame Festival game begins and Mizuki is in the same group as Yuuma and his friends. While the phones are being exchanged, Mizuki's phone is in Kirika Sakuragawa's hands and he mentions that Kirika is free to look into his phone, but Kirika is too scared to see into Mizuki's phone. When the phones are exchanged for the second time, both Mizuki and Yuuma's phone are exchanged and Mizuki says that they will both see into each others phones together. Mizuki reveals Yuuma's first memories and the fact that he has amnesia. Mizuki also taunts Yuuma by reading the said person's diary entries, exposing Yuuma's misanthropic views, and the fact that he finds the world boring. Yuuma reacts quite violently to that, making a move to snatch his phone back. Mizuki sends Yuuma to the edge as he delivers the final blow, which is the voice recordings of every single grateful message sent to Yuuma, claiming that, "he must've listened to it every night". Yuuma suddenly screams in pain and his scar bleeds out.When Yuuma finally showed his "true" color, Mizuki said he is glad to see his "true" color and replies he likes current Yuuma a lot more than before. Mizuki let Yuuma see his phone and said his phone didn't have anything to see. Soon, Mizuki's phone is ringing and it's showed "Country of Despair" calling him, hearing a woman's voice which make him think it's his mother who's calling him. Then, Mizuki realized that the voice doesn't belong to his mother but a virtual assistant app and he is tricked by Yuuma. Mizuki said he changed his opinion said that instead of like, he hates the current Yuuma a lot more than before. Then, Yuuma explained the actual plot of the Country of Despair, which Yuuma shows that the book has empty pages intended to allow the reader to see through the last two pages together. This causes the two pages to overlay on each other, presenting a different ending. This overlay turns the noose that originally hung from the ceiling into a sword being pointed at God. "God's invitation was for the country of despair. Pietro's unhappiness was the author's own". At the bottom of the overlayed pages is a bar code which was a message to the reader not to die, changing the story from one of despair, to one of hope. Suddenly, Mizuki goes crazy as he can't believe this is the actual story of Country of Despair and he tried to prove this by his own, realized Yuuma didn't said anything wrong and said he will never meet his mother again. Then, Yuuma deleted all of Mizuki's despair collection included his very first photo which is his mother's death face, he is saddened and started to sob due to the fact he can't see his mother anymore. When Mizuki is crying, Yuuma stood in front of him and told him don't act like a crybaby or else he would die here, though it's soon stated by Yuuma that he didn't have any use anymore.
During the SNS Hide-and-Seek, Mizuki joined sides with Yuuma to fight against the hunters, soon he replies Yuuma has changed his life since the Big Flame Festival so he will forever follow Yuuma and work together. Yuuma disagrees and tells Mizuki get out but Mizuki doesn't listen. Later, Mizuki become Yuuma's follower and uses handcuffs to lock Yuuma's right hand so he won't leave him. When the DQN Marble found Mizuki and Yuuma, he saved Yuuma's life by protecting him with his body but he is heavily injured instead. Mizuki requests Yuuma to bring him to the hospital to heals the scar, Yuuma originally doesn't want to do it but due to the handcuffs on his wrists so he is forced to do so. Later, Yuuma succeeds in bringing Mizuki to the hospital and is healed by Tamae Hanada, who is Mizuki's follower. After Mizuki finished the mission that has him to scan his follower's "Marble's mark", he stated that Yuuma is still not saved yet due to Ayame Kamijou is still his follower and hasn't finished the mission yet, Yuuma soon realized Mizuki wanted him to unfollow her so both him and Mizuki's life won't be in danger, but Yuuma doesn't and saved her from her brother, Shoujo Kamijou.After Ayame is saved, he asks her if she want to eat raw meat or not, but she declines, though he said even if she wanted some he wouldn't give her the raw meat. Later, when Mizuki and his group were attacked by the hunters and DQN Marble, both he and Ayame tried to make Yuuma calm down and Mizuki replies that he is very surprised the connection between SNS (Mizuki, Yuuma and Ayame) are way stronger than connection of their actual family members. Then, Yuuma drives the car and tells Mizuki and Ayame to die together with him and Mizuki has no problem with it. When another new mission was announced, along with Yuuma and Ayame, Mizuki has gone to see Mitsuru Kariya to reunite the follower once again, and they completed reunion except Yuuma due to the fact Mitsuru despises him so much. After Kirika's name is listed in the death list, along with Yuuma they went to "kill" the DQN Marbles. Both Mizuki and Yuuma attempted to "kill" DQN Marbles, while failing they find out the solution of how DQN Marble knew which were players. After Yuuma learned Kirika's last words meant, he and Mizuki tried to changed their GPS position from Japan to Hawaii and it worked. Though when the last DQN Marble was about to fall off from the Tokyo Tower, Yuuma and Mizuki set their GPS back to normal and took revenge for the players who died at DQN Marbles' hands, they defeated DQN Marble and Mizuki saved Yuuma from from falling down with the DQN Marble. Later, along with Yuuma, Ayame and Chiho went to the Real Account company building, in order to obtain the "Player Revive" technology to destroy Real Account. After Yuuma found Nanako Yuzuhara's corpse, Mizuki tells Yuuma that she is dead but Yuuma can't believe it and punched him. Shortly after this, Nanako calls Yuuma on the phone and replies she is in Real Account world now. When Yuuma arrives at the big gate, Marble announced another new mission where every players returns to the place where they started the death games. Because of lack of time and finding the technology, Yuuma decided to ask everyone for who would stay with him, Mizuki answering yes and said he would be happy to see Yuuma's dead expression and he will die together with him. Mizuki and other has to try their best to thinking what the password of the big gate would be, until Yuuma finally figured out the password and the actual place of where the start point the mission meant. After it is revealed the death games are taking place in real world, Mizuki mentions why was he so idiotic to not realize about it until now when there's so many things can prove they're not in the internet world but in real world (Wounds, bloods, feeling). While Yuuma is trying finding Nanako, Mizuki found a small entrance, entered it and saw Marble and other players were here to celebrating the end of SNS Hide-and-Seek.
After SNS Hide-and-Seek finally ended, Mizuki goes out with Marble and the other players, they were surprised at the players who originally would die at stadium were all returned to the Real Account area thanks to Yuuma using CAP Technology. Soon after Marble were punched by Yuuma, he decided to destroy the Real Account company due to not being able to continue the death games anymore, Mizuki saved Yuuma from nearly hit by the rocks from ceiling.
Along with Yuuma and the other players, Mizuki survived from the crushed company rubble.
Chapter 71- (Third Season)Edit
Sometime after the event of Second Season, Mizuki closed his suicide website along with Real Account official page. During August 27, Yuuma calls Mizuki to joins Ayame's birthday party at beach. When the group comes into the beach, Mizuki is sad and had no energy due his fear of water and the sun. Yuuma pushes him into the water and tells him to not be stubborn. Mizuki is sad again due to the raw meat being cooked, and asked Yuuma if he can live like a normal person or not. Yuuma answered with Mizuki can as long as he really wants to do so, as he suddenly agreed with Yuuma. After returning home, Mizuki started to draw a lot of storybooks and finished a lot of artworks in one whole night, but he soon forgot about this.
Half years after the event of Second Season, Marble has reappeared as "True Marble", he chose 30 players to join the Real Account Tower and play the death games once again, Mizuki is one of the 30 players chosen by Marble.
During when the first game started, Mizuki is finding his own way to the goal and suddenly met Kotoko Tobe, who is known as a serial killer. Mizuki states he knew about Kotoko due to one of his customer at his suicide website mentioned his family were killed by her, and they start fighting each other. When Kotoko asks why does Mizuki like Yuuma so much, he response is because Yuuma has changed his life from killing for the despair to killing for Yuuma, he also stated he is living for Yuuma and he would do anything for him, even if Yuuma wants to kill god. Soon, Mizuki saw Yuuma was beaten by Magura Aizawa which surprised him a bit.
After the first game finished, Yuuma noticed Mizuki had been showing a weird expression lately. Yuuma asks what's wrong with Mizuki, Mizuki only responds he would kill Yuuma one day. Mizuki's wish that he wants to achieve by Marble is "Kill Yuuma with cutting every part of his body to none".During the ID Gather Game, Mizuki is in a tag-team with Hako and Yui Akariya. When Hako tells Mizuki can join his new world, he replies that Yuuma is not chosen and he will die soon, which makes Mizuki enragedand tells him to not disrespect Yuuma or he will be killed. Then, Hako tells Mizuki to see what's Yuuma doing now and he sees Yuuma being friendly and playing with OL Marble. Mizuki was disappointed at Yuuma and starts crying, he states he will join Hako's new world and wants to kill Yuuma. Soon, Mizuki works with Hako to play the game, and they finish the game. Mizuki is watching over Yuuma and hope he doesn't die here, as Mizuki wishes he will be the one who would kill him. After the second game is finished, Mizuki comes into Yuuma's room and tries to kill him, he said he is disappointed in Yuuma and he is no longer the Yuuma who is strong, scary and never frightened at anything that he knew, Mizuki leaves and tells him that he will kill him someday.
As the third game started, Mizuki is working together with Hako once again, Mizuki is slowly starting to be brainwashed by Hako. Later, when Yuuma meets Mizuki it's shown that he is abused by Hako and he said he liked it. Then, Yuuma breaks his own finger to show how he wants to reunite with Mizuki, he tells him they will having a match to fighting each other at 9:00 p.m and Mizuki agrees. When Yuuma and Ayame arrived, the match is started. In the whole fight, it's revealed all Mizuki want is a dominator who can gives him a lot of despair but all of this were destroyed by Yuuma during the Big Flame Festival game. Yuuma, then replies Mizuki also did the same thing to Yuuma too and that's what caused Yuuma changed his personality completely, even so he still hopes they can reunion once again because they are friend. Shortly after that, Mizuki defeated Yuuma but Yuuma still catching the iron chain on his right hand, which is the handcuff he wears together with Yuuma during the SNS Hide-and-Seek. Ayame summons Electric Girl shocks Yuuma to awake him. When Yuuma is awake, he shows Mizuki's drawing picture to him in his phone, which is said to be draw by Mizuki himself. One of the storybook Mizuki written, "Thieves and the Juvenile Myuu", is showed the concepts of the storybook is based on the events happened to him in half years ago, the thieves are even based on both Yuuma and Ayame. Yuuma stated all Mizuki actually want is not a dominator, but a real best friend that understanding each other. When Mizuki realized what he wants, his head is started hurting and Hako tried to brainwashing him again but it's stopped by Yuuma. Suddenly, Mizuki noticed how scary Yuuma was during he attack Hako, Mizuki realized Yuuma didn't become weak but become even stronger than before, it's just he can't see it. Yuuma requests Mizuki to joins with him and Ayame repeat to said the line Mizuki said once before, that the connection between SNS are way stronger than connection of their actual family members, then Mizuki agreed and the former "SNS Hide-and-Seek-Yuuma Team" were reunion once again. Shortly afterward, Hako used one of his pocket monster's ability to steals every pocket monsters that Mizuki owns, so his pocket monsters collection are all empty.
Soon, they found the hotel and resting at there. Yuuma is thinking how to re-catch every pocket monsters to Mizuki. Mizuki respond he don't care and he said he can die here but Yuuma don't allow it. Then, Mizuki think of apologize to Ayame due to what he did to her during the fight against Yuuma, but he don't know what should he do other than giving a ton of raw meats to her. Mizuki fall asleep after the apologize, and his face look a bit better than usual after awake. Yuuma said he figured how to help Mizuki to re-catch every pocket monsters before the deadline, but Mizuki disagree as Yuuma and Ayame still haven't catch all 50 pocket monsters and this plan is too dangerous. Then, Yuuma summoned one of his monster and used it's ability to guess if this plan will gonna works or not, however it's not. Even so, Yuuma still try to do so and Mizuki have no choice but agreed with him.
During the plan, Mizuki hidden himself and using the iron chain that Hako gives him as a trap, in order to make Planning Department Chief Marble fell into the trap, shortly they successes to steals all of Dr. Marble's pocket monster. Soon, all of pocket monster Yuuma steals are all returned to Dr. Marble by using his stealing monster's ability. Yuuma thought it's failed and will lose, but suddenly Yuuma obtained a No. 101 Pocket Monster, King Swagger Mouse by fused all of Swagger Mouses into one. With the helps of Karua Sakurame and her followers, the King Swagger Mouse's power has reached 5369% energy and they successful defeated Dr. Marble.After Real Account Go is ended, along with Yuuma and the others are making a funeral for the players die in this game, but soon Airi Homura destroys the funeral by burns the area. During the night, Mizuki is watching over Yuuma's room to make sure no one gonna attack him. Kotoko shows up and went to kill Yuuma due to he killed Dr. Marble, but it's stopped by Mizuki. On the second day, the fourth game is started, following Public Relations Officer Marble's order Mizuki have to tagged with Kotoko. Mizuki is not happy to working together with Kotoko, which causing he want to fight against her every times. As the time progress and fight goes, Mizuki is slowly started to know about Kotoko's back story and wonder what is she actually wants. When Kotoko wants to kill Yuuma, Mizuki comes to stop her and fight against her. Kotoko finally falling down and lose to Mizuki. Shortly after Kotoko's defeats, the Unscrupulous Hunter Marbles suddenly came to giving her a punishment but Mizuki defend her. When Kotoko is nearly dead, her eyes can't see things properly and she thought Mizuki as her long death son, she replies she is feel so sorry to him due to she never care about her son even when he is killed by a serial killer, Kotoko said all she feel during when she killed person for a first time is not revenge but instead it's make her interests at killing. Then, Mizuki is realized all Kotoko actually want is not killing but finding someone to gives her a punishment. Kotoko requests her "son" (Mizuki) to kill her, Mizuki accepted and said good night to her for die peaceful. After Mizuki killed Kotoko, Yuuma comes to comfort him. Public Relations Officer Marble shows up and said Mizuki did a good job on killing Kotoko as she is a serial killer and she is evil, which makes Mizuki so angry and wants to fight him but he falling down shortly after being injured by Kotoko in the previous fight.
Yuuma and Airi Homura bough Mizuki to the hospital and requested Isuke Benimoto for heals Mizuki's wound. As there's no any blood packs can uses, Isuke used Kotoko's blood from her collapse to heals Mizuki. During Yuuma fight against Zui Zakuro, along with Airi, Ayame and Sayaka Shiiba is locked in a steel cage. When Yuuma is nearly lost all the points, along with Airi and Ayame was comes to defend Yuuma by losing their own point. After the end of the fourth game, Ayame noticed that the scar in Mizuki's face is still around. Mizuki stated that originally he have one another scar in his belly and wanted to keep it so he can shared the same scar with Yuuma, but since Yuuma already healed his belly Mizuki have no choice but heals it as well. Ayame wonder how comes that scar on Mizuki's face is still around if he did uses the Healing Tanks, he stated that it may be causes of the scar being too big that was unable to dissipate. Thought the truth about why Mizuki keep that scar is because of Kotoko and he wanted to keep it as to be forever remembered Kotoko.One day after the fourth game finished, the fifth game is started with every players wears school uniforms. During the game, Mizuki suspect that Airi is the Chairman Marble but she isn't. As the results, Airi is killed by Marble with freezing her into a giant ice. Before Airi's death, Mizuki apologize to her because of he mistaken her as the Chairman Marble. After Yuuma's third stage of "symptom" is finally awaken, Mizuki stopping him form killing people and replies he wants to joins current Yuuma and killing the people all around the world together, which Yuuma feels he is boring and returned to his second stage. Shortly after Kanata Hidzuki's death, Ayame requested Mizuki and Aiji Hoshina works together to finds the true identity of Chairman Marble, in order to save Yuuma from mistakenly for being Chairman Marble. Both Mizuki and Aiji don't want to work together due to Aiji's personality and he is Ataru Kashiwagi's panther, but Ayame stopped both of them and tells them must works together. Mizuki and Aiji agreed with Ayame and they started their mission to finds the Chairman Marble. Both Mizuki and Aiji returns to the class and starts doing their "job", locking Yuuma into a storage to prevent him from gone berserk again and start injuring the players with his knife, in order to find who is the Chairman Marble. Shuu Kuze tried to stop Mizuki but it didn't work. When Mizuki is beginning to attack Karua, Ayame and Mamoru Nirata comes to protect her from being attacked by him. Ayame mentions Mizuki is crazy for using this plan to find the Chairman Marble and says he doesn't even want to trust his friend. Mizuki has no choice but also have the urge to attack Ayame as well. Before he manages to attack them however, The poll was mysteriously started earlier and everyone must vote someone before everyone will die in 10 minutes. Chairman Marble announced that violence and injures people is forbidden, which makes his and Aiji's plan failed.
After Karin Koma revealed herself as the Chairman Marble, Mizuki called her out and asking that if she really was the Chairman Marble or if she was just lying. This caused Karin to get angry and took Mizuki's knife to attack him, though Paru-kun comes to protect him from her attack. Because of this, Karin ended up breaking the rule about no violence and gets killed by the Sports Teacher Marble. After the third voting result is out and revealed that Karin isn't the Chairman Marble, along with Paru-kun they went to the health room to heals their injures. Soon, with Ayame stating they will never leaves Yuuma alone and will protect him from the "symptom" and other people's attacks forever. After Yuuma thanks them, he realizes that the game still hasn't ended yet. Yuuma asks Mizuki, Ayame and Paru-kun to share the information they knew so far to him. Soon, along with the other 17 players were voting their own name under Yuuma's order.
After the end of the Anonymous Classroom, along with every players except Yuuma was "captured" by "Human Resources Marble", Yuuma needs to save them before they will be killed. When Mizuki and other captured players was about to die, they surprised Yuuma by saying "happy birthday", as this day was Yuuma's birthday. Soon after explaining things to Yuuma, they continue to celebrating Yuuma's birthday.
A day later, the last trial of Real Account Tower has begun with Ataru as the organizer. Along with other players was sent into a VR world and started the game. Yuuma order every players to tag-team and finds any news on the island, while Mizuki just finding the news in his own. After Isuke and Yasuharu Tanaka was killed and revealed the trial name was "Fake News Island", Yuuma sent a message to every players that they must have to finds the news carefully so they won't fell into a death traps.
After Yuuma discovered where's the location Ataru at from Haru Ichinose's hint on sports ground, he and the others come to the rest room. With Yuuma punched the mirror, it's revealed that Ataru is hiding inside a mirror. Soon, along with the remaining 15 players went to the football playground. Ataru announced that they will play a second trial named "Fake News Football". Along with Ayame, Mizuki is chosen by Yuuma as his partners. In the first match, it's revealed that Mizuki is not good at playing football, in which his kicks is always missed. When Yuuma is about to hit by a real information football, Mizuki protect him from the hit, which caused him broke the rules and suffered on a nightmare dream for 10 minutes. When the second match started, Yuuma gives the real information football to Mizuki in secret. After it's revealed the real information football is on Mizuki's side, he tried to kick the ball but apparently missed again. Although Yuuma jumped up and kicked the ball to Ataru, which makes Yuuma's team wins the second match.
- Superhuman Speed - Mizuki can do a very fast moves with his attacks.
- Mizuki hasn't slept for a several years. Thought it's started getting better in the later story.
- Mizuki only likes to eat raw meat, when he eats cooked meat he wants to vomit.
- It's shown that Mizuki really likes Yuuma, he is even prepared to die for him.
- Mizuki's wish that he wants to achieve by Marble is "Kill Yuuma with cutting every part of his body to none".