The last day of school before summer vacation. Suddenly, Kenta receives a mysterious letter. After school, he goes to the old, abandoned school building, as the letter said. There he meets Jinpachi, Miyuki, Rika, Kotomi, Akemi, his teacher Kami, Munemitsu, and Mio. It turns out that everyone received the same letter. Everyone decides it's someone else's joke, and start arguing about who it could be. Suddenly, they hear someone blocking the entrance... The nightmare begins, as the girls disappear one by one. Rika is the first to disappear, having been raped...