In Chinatown, there is an intriguing pet store owner named Count D who specializes in selling unique pets that are hard to come by. His clients are people looking for something extraordinary, but with every sale comes a contract. As long as the terms of the agreement are followed, everything proceeds smoothly. However, if someone disregards the rules of the contract, Count D's pet shop cannot be held responsible for any unforeseen consequences that may arise. Detective Leon Orcot has been investigating a series of mysterious and inexplicable deaths that all have one commonality: they were customers of Count D's pet store. He aims to discover the reason behind these strange occurrences.