A hitman's muscle memory trapped in a kid's body, forced to blend in at middle school while his brain is still running assassination protocols. The comedy comes from watching a 39-year-old war machine navigate cafeteria politics and homework with the same lethal precision he once used on crime syndicates. Every awkward classroom moment is a man who has killed for a living realizing that surviving thirteen-year-olds might actually be his hardest mission yet.
Juuzou Oogami has spent decades as an untouchable hitman, a man whose reputation precedes him. After eliminating a major crime syndicate, a strange wasp attack leaves him unconscious and awakens a nightmare: his legendary forty-year-old body has somehow become that of a thirteen-year-old child. Before he can process the impossible, his boss hands down a cruel order: return to active duty by infiltrating a middle school. Trapped in the body of a kid, Juuzou must navigate halls filled with adolescent drama, friendship groups, and genuine human connection for the first time in his life. The school becomes his new battlefield, except now the dangers are both mundane and lethal. Enemies from his past hunt him, assassination contracts cycle in, and classmates demand emotional vulnerability he's never learned to provide. Between dodging death and actually passing history class, Juuzou discovers that surviving middle school might prove harder than any job he's taken. The countdown to finding a cure drives the action forward, but the unexpected bonds forming around him raise a more complicated question: does he still want his old life back?