Naoya Imai and Kohei Murakami live with a mysterious, beautiful girl named Neko. The cat's lower body is a "lucky charm." Not only does it bring them dazzling pleasure during sex with the two men, it also brings them extraordinary good fortune. However, as Naoya and Kohei each begin to desire to monopolize Neko, a rift begins to form in the strange life of the three of them...