Hasegawa Ken and Kamimura Kazutoshi

“if Kamimura can forgive me, thats enough. -Hasegawa Ken backround info! The true catalyst for Ken’s downfall is the sheer, unmitigated violence of Chapter 3. During this chapter, Hanano Okazaki (the Ultimate Mask Artisan) kidnaps, tortures, and kills Kazutoshi Kamimura, who is the Ultimate Crime Scene Cleaner. Because Kazutoshi served as Ken’s absolute emotional anchor and the only person he felt fulfillment with, his death completely destroys Ken's stability. To make matters worse, Okazaki leaves behind a deadly collateral trap: when Manami Tsuno and Masanari Wada investigate the woodshop to find Kazutoshi's severed head, Okazaki’s spring-loaded spike trap lunges forward and impales Manami Tsuno, killing her slowly. During the Class Trial, Ken is forced to watch Okazaki undergo a hysterical, sinister breakdown before being executed by a ceramic cast of molten gold poured over her face. Ken is left utterly alone, entirely stripped of his anxiety medication, and completely traumatized by the loss and mutilation of his closest friend. Chapter 4: Environmental Torture and the Rigged RealityIn Chapter 4, the mastermind introduces severe environmental hazards, forcing the remaining students to navigate structural collapses and total blackouts within the laboratory. The psychological toll peaks when a highly complex murder occurs involving intricate trapdoors and precise timing. During the ensuing trial, a devastating cognitive revelation comes to light: the students discover they have actually been trapped in the lab for an entire month, but their memories were deliberately wiped by the mastermind. For an intellectual champion like Ken, learning that his own brain has been edited is a catastrophic blow. Looking around at the surviving cast, Ken realizes they have all become feral, self-serving hypocrites willing to step over any corpse to escape. His calculation is simple: standard survival is mathematically impossible because the game is completely rigged. Chapter 5: The "Blackened" Blueprint Trap and Ken's ExecutionBy Chapter 5, Ken’s grief over Kazutoshi’s murder and his deep resentment toward the surviving students curdle into a desperate, self-destructive malice. Refusing to wait around to be slaughtered, Ken decides to orchestrate his own crime using hidden architectural blueprints and staff passages to play a malicious "night game" trap. When his grand plot is ultimately exposed during the trial, Ken experiences a total, unhinged psychological meltdown behind the podium. He grips his head, sweats frantically, and screams at the courtroom—not out of hatred, but out of absolute heartbreak because his peers still refuse to admit how ugly and selfish the killing game has made them.