Welcome to the most magnificent pet shop in Chinatown! Operated by the shadowy Count D, the shop specializes in rare and hard to come by pets... but with each sale comes a contract. And if that contract is broken, watch out! Detective Orcott has linked many odd and unexplained deaths to Count D's shop. Will he solve the mystery or fall prey to it?

En noche buena, un virus es intercambiado en Rusia. La persona intercambiando dicho virus, Maya (Kichise Michiko), viaja a Japón para liberarlo. El alias; "Bloody Monday". La agencia de inteligencia busca a Takagi Fujimaru (Miura Haruma), estudiante de escuela superior y pirata informático, para que los ayude a controlar dicha amenaza.