The blackmailed Juzo and the brainwashed Chisa both tell Kyosuke that Junko is innocent, allowing her to move onto the final stages of her plan. As Junko has the brainwashed Reserve Course students storm the main building and kill the other students before driving them to kill themselves, the 77th class set off to spread despair across the world while Izuru goes off in his own, curious about whether he still possesses some of Hajime's memories. In order to protect his remaining students in the 78th class, Jin has them convert the school's old building into a shelter, unaware of the two Despairs who lurk among them. Some time later, Hajime and Chiaki meet each other in a virtual world.

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Junko overpowers Juzo and deduces that he is in love with Kyosuke, threatening to expose his feelings for him unless he does what she says. Meanwhile, Chisa, who has been driven to despair by Junko's despair video, sends Chiaki down to an underground room where she is greeted by Junko. Deciding that Chiaki is the final element needed to complete her prototype video, Junko traps her in a labyrinth filled with deadly traps, forcing the rest of the class to watch as she struggles in vain and is ultimately fatally wounded by skewers. The resulting despair warps the students, completing their transformation into the Remnants of Despair. In her final moments, Chiaki tries to remind Izuru of the person he once was before passing away, leading Izuru to shed tears for the first time since his transformation.

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Chisa shows up to confront Junko, who reveals her plan to brainwash her class into Ultimate Despairs, showing its effectiveness by having a student kill himself on command. Meanwhile, Chiaki escapes with Nagito and informs the rest of the class, who decide to go help their teacher. While Chisa is forced to watch Junko's video of despair while Mukuro tinkers with her brain, Junko brags about her plan to Ryota, who can do nothing but flee in shame, before she is confronted by Juzo. As the class arrive at Junko's hideout, Mikan pushes Chiaki through a hidden passageway, where she reunites with Chisa, unaware of what has happened to her.

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After noticing that Mikan has been acting strangely around Junko, Ryota is shocked to discover a video of the student council's killing game. Junko reveals that she plans to combine this video with Ryota's anime to create something that will brainwash people and send them into despair, threatening to subject his classmates to another killing game should he refuse to cooperate. Meanwhile, as Kyosuke arrives to help deal with the Reserve Course riots, Nagito, who has returned from his long absence, mentions that he has seen Mikan on the school grounds, prompting the rest of the class to go off in search for her. During their search, Nagito leads Chiaki to the secret room where Junko and Ryota are, having swordswoman Peko Pekoyama hold off Mukuro. Nagito attempts to shoot Junko but is stopped by Izuru, who Chiaki recognises as Hajime, while Ryota escapes and runs into Chisa, who rushes towards the scene.

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Junko gets Ryota to show her the anime he has been working on, learning that various techniques akin to subliminal messaging are used to prompt emotions from its viewers. Concerned by his absence, the Ultimate Imposter sends Mikan to check on Ryota's dorm, where she is captured by Mukuro and brought to where Junko is having Ryota work. Later that night, Junko and Mukuro break Izuru out of his facility and take him to Hope's Peak Academy, where they coerce a classroom of students into killing each other. As Hope's Peak's principal, Jin Kirigiri, prepares to take his own action, Junko spreads word about the experiments and incidents that Hope's Peak tried to cover up, leading the Reserve Course to rebel.

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With his original personality removed and his body infused with every known talent, Hajime emerges from the experiment under the new persona of Izuru Kamukura. Later, after the 77th class move into a new building, Chisa sneaks into the trustee's office, where she learns all about the Kamukura Project, which is designed to create a Super High School Level Hope. Meanwhile, Junko and Mukuro kidnap one of the trustees, using his eyeball to sneak into where Izuru is being held and try to sway him over to the side of despair. After getting knocked out by Izuru and winding up in hospital, Junko becomes excited when she encounters Ryota on his way to a check-up.

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After spending half a year teaching the reserve class, Chisa asks Juzo for a trustee's ID in order to investigate something known as the Kamakura Project. Managing to return to her position as homeroom teacher of the 77th class, she is relieved to find that Chiaki has managed to keep everyone together and is given a warm welcome. Meanwhile, it is revealed that Ryota has been spending all of his time at home working on an anime, having the Ultimate Imposter take his place in class. Elsewhere, Junko Enoshima meets up with her sister, Mukuro Ikusaba, as they prepare to enroll into Hope's Peak as part of the 78th class. When Ryota ends up collapsing with a fever, the Ultimate Imposter seeks out nurse Mikan Tsumiki to treat him, explaining how he took on Ryota's identity so that he could stay at home and animate. As the new school year begins and the 78th class begin their life at Hope's Peak, Hajime goes through with the Kamakura Project.

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With the class preparing for a practical exam despite the gloominess following Sato's death, lucky student Nagito Komaeda approaches Seiko for a laxative he can use to postpone the exam. At the same time, Ruruka asks Seiko for a performance enhancing drug to use in her pastries for the exam. However, Nagito gets the two drugs mixed up, later accidentally getting his bag switched with Seiko's. As a result, Ruruka ends up using laxative in her sweets while Seiko finds herself with a switch to a bomb Nagito was planning to set off, leading the two to distrust each other. Elsewhere, the drug Nagito picked ends up causing a dog to grow in size and break into the gymnasium, causing the bomb to be accidentally set off. Following the chaos, Seiko, Ruruka, and Sonosuke are all expelled, Nagito is suspended, and Chisa is reassigned to the Reserve Class.

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Natsumi pompous attitude gets her in an argument with Sato, the friend of photographer Mahiru Koizumi, who were both in a photography club with her. Trying to pry the two apart, Hajime learns of Natsumi's determination to get into the main course and be recognised by her brother. The next day, Hajime arrives at school to discover that Natsumi has been murdered, suspecting that Sato may have been responsible. After Sato is found dead a few days later, Hajime tries to confront Mahiru over what happened, but is stopped by security guard Juzo Sakakura, who insults his lack of talent. As Chisa and Juzo worry about the direction Hope's Peak Academy is heading, Hajime prepares to take part in an experiment held by the school to receive an artificial talent.

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Chisa Yukizome takes her investigation to the Reserve Course and hopes to get information out of Hajime Hinata. Chiaki Nanami attempts to make friends by using her love of gaming to help her classmates bond, successfully bringing her crazy class together.

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Chisa Yukizome, a former student at Hope's Peak Academy gets hired as a new teacher for Class 1 - B. However, most of the students didn't show up for class, leaving Chisa, Fuyuhiko Kuzuryu, Hiyoko Saionji, Mahiru Koizumi, Sonia Nevermind and Mikan Tsumiki to look for them. But things can get pretty crazy when the Ultimates are at play.

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