A series of student suicides occurred at Kitafu High School. One hanged himself in the school bathroom, and two jumped from the school building. They left behind suicide notes with the same words: "I was too loud in the classroom. I need to be tuned." To Tomohiro Kakiuchi, the deaths of the three were undoubtedly suicides—or so he thought. Until he heard what Mizuki Shirase said. "None of them committed suicide. He killed them all." The worst incident occurred in the best class.

A Collection of short stories related to cats by various authors. All you need is Cats isn't it?!?! -[Kodansha](https://www.kodansha.co.jp/comic/products/0000013463)

1. **Tanoshii Houkago** (楽しい放課後) 2. **Kumo Onna "Futari Kiri" (蜘蛛女「二人きり」) 3. **Tsuugakuji no Akui** (通学路の悪意) 4. **Houkago no Nanafushigi** (放課後の七不思議) 5. **Kage Fumi** (かげふみ) 6. **Futari no Cinderella** (二人のシンデレラ) 7. **Ushiro no Shinrei-chan** (うしろの心霊ちゃん)**

A series of student suicides occurred at Kitafu High School. One hanged himself in the school bathroom, and two jumped from the school building. They left behind suicide notes with the same words: "I was too loud in the classroom. I need to be tuned." To Tomohiro Kakiuchi, the deaths of the three were undoubtedly suicides—or so he thought. Until he heard what Mizuki Shirase said. "None of them committed suicide. He killed them all." The worst incident occurred in the best class. A lonely mystery begins.