Neko Hai Darake no Toki Naoshi

A locked classroom, barricaded with desks and chairs. In front of him is his own body, tied to a chair. The boy realizes he's dead. This is a mystery novel about a literary club. Iori Orita, a second-year high school student, is asked by a stranger, a first-year girl, to solve the mystery of the boy's death in this novel. While he's tied to a chair, just like in this novel. She says she'll do anything in return, and he decides to accept her request, but...?!