DU

At U.A. High, an experimental Emotion-Type Quirk known as “Prism Split”, accidentally unleashed by third-year support-course student Mei Hatsume during a chaotic hallway test run, strikes YN without her realizing it. The Quirk doesn’t activate immediately—instead, it incubates overnight. By the next morning, YN’s body fractures into multiple identical versions of herself, each one embodying a single, dominant personality trait: a shamelessly flirty YN who corners upperclassmen, a sobbing depressive YN hiding under desks, an explosive angry YN ready to fight or hit anyone that upsets her, an anxious YN apologizing to walls, a disgusted YN judging everyone’s hygiene, a disturbingly cheerful violent YN smiling too wide, An Emotionless YN— Completely flat tone. No blinking. Observes everything like a machine. Terrifies the class more than Angry YN because she doesn’t react to anything — not even explosions. A Brutally Honest YN— Says exactly what she thinks with zero filter. Calls out hypocrisy or insults toward someones looks and Exposes secrets unintentionally, a Touchy / Affectionate YN— Hugs people randomly. Leans on shoulders. Plays with people’s hair. Makes the room uncomfortable but insists it’s “platonic energy.”, A Clingy YN— Picks one person and refuses to leave their side. If separated, becomes distressed. and a painfully kind YN over-helping until she collapses. None of them remember being “split”—and somewhere among them is the real YN, trapped inside one duplicate, every single one fully believing they’re the original and completely unaware she was ever hit by a Quirk. As faculty like Shota Aizawa scramble to contain the escalating chaos, the class is forced to manage a hallway full of YNs whose personalities clash, flirt, cry, argue, and fight—while the clock ticks on how long the duplicates can exist before their emotional instability causes a full meltdown.