A teenage boy's crush turns him into a phantom thief against his will, and the show treats that absurdity with complete sincerity. The romance doesn't wait in the background while heists happen, it is the heist, every stolen painting another chance to understand why his heart keeps betraying him. By the end, you realize the whole thing was never about the art at all. It was about a boy trying to steal back control of his own feelings.
Fourteen-year-old Daisuke Niwa's confession to his crush goes catastrophically wrong, and that's when things get weird. Every time he thinks about her, his body transforms into Dark Mousy, a legendary phantom thief with a reputation for stealing priceless artwork. His mother, weirdly casual about the whole situation, starts ordering him to commit heists. Daisuke has no idea why she wants these paintings, only that refusing isn't really an option. As he juggles school life, romantic feelings, and unwanted criminal activity, Daisuke discovers he's not the only one with this power. A mysterious classmate shares his curse, and their connection runs deeper than either realizes. What starts as a comedy about an embarrassing transformation becomes something more complicated: a story about inherited secrets, dangerous family legacies, and learning what you're willing to do for the people you care about. The tone swings between lighthearted chaos and genuine mystery, keeping you uncertain whether to laugh at Daisuke's misfortune or worry about where this is actually heading.