A huge oshie-hagoita (wooden paddle decorated with a brocade portrait) from an anonymous sender suddenly arrives at the art room that has been transformed into the Pretty Boy Detective Club headquarters. The Pretty Boy Detective Club deduce that the sender was Kodaki Kawaike, a first-year student at Yubiwa Academy and Nagahiro’s young fiancee. Contrary to her beautiful looks, Kodaki is feared by the Detective Club members as a demon...