Three years before he meets a certain girl, Hijiri Matsubase leaves the police force to fulfill his dream of running his own detective agency. Life does not go smoothly, and the unfortunate detective finds himself deeply in debt after being swindled. Just as his situation seems hopeless, Aketoyo, the son of a billionaire, approaches Matsubase with a peculiar proposition: entertain me, and I will pay you 100,000 dollars per case. This deal with a devil proves to be as tempting as it is dangerous, pulling Matsubase into a world where justice and corruption blur. The story follows the brilliant but down-on-his-luck detective as he navigates morally ambiguous cases while tethered to a client who treats investigation as a game. Set in a contemporary Japanese cityscape, the manga explores Matsubase's fall from grace as a former officer and his complex partnership with the wealthy and enigmatic Aketoyo. The narrative arc centers on Matsubase's struggle to maintain his integrity while being financially bound to someone who values amusement above all else, with each case revealing more about the dark pact between detective and benefactor.