Reiki Beni (Tomonori Hirose), the second head of the Beni Detective Agency, along with his partner Shoji Ai (Gentoku Aoki), underground idol Saori (Asuka Kishi), and Yayoi (Reiko Yakima), Reiji's grandmother and the owner of the detective agency, spend their days searching for pets and investigating cheating at the detective agency they inherited from their grandfather.
High school student Shun Takahata is bored. Bored with the day-to-day monotony of school and life, he prays for change, for something exciting. Suddenly, he and his classmates are forced to play deadly children's games and facing terrifying creatures from a talking Daruma doll to a sharp-clawed lucky cat.