Moriarty wakes up in a girl's body with his genius intact and zero patience for the nobility's casual cruelty. He doesn't save her through love or redemption, he dismantles the system crushing her with the same cold precision that killed him at a waterfall. Six episodes to watch a criminal mastermind weaponize his own powerlessness into perfect vengeance.

James Moriarty, the most feared criminal of all, dies after a showdown with a famous detective and is reborn as a ghost in another world. There he possesses Sherry Moriarty, a beautiful young noblewoman at the elitist All Blue Academy who is tormented by other aristocratic daughters, and he saves her as she tries to end her life. He has lost his name and his past but keeps his brilliant criminal mind, and in a world with no great detective he turns it to one purpose: helping Sherry take revenge on Porgrette Whey Cochon and the other girls who made her life miserable. Together the two Moriartys set out to plan the perfect crime in this short-format fantasy revenge story.