A scrappy group of high school misfits stumbles into the perfect cover story: they'll pretend to be the notorious phantom thief Tonchinkan, rotating who plays the notorious criminal between them. Nobody suspects that the legendary burglar is actually five different people trading the role like a relay race. The whole thing starts as a lark, a way to blow off steam and feel dangerous without actually hurting anyone, but keeping the secret from their classmates means constant improvisation and increasingly elaborate schemes to maintain the illusion. What begins as harmless fun spirals into genuine chaos. Each member brings their own ridiculous energy to the role, leading to mishaps, close calls, and situations that somehow always work out through sheer dumb luck. The real comedy emerges in how their actual personalities keep bleeding through despite the masks and aliases, threatening to expose the whole operation. Between dodging suspicious teachers, dealing with actual police interest, and managing their own clashing egos, this gang discovers that playing criminal mastermind is way harder than the real thing.