It's back-to-school time... CLAMP School that is! In this latest volume, something mysterious is about to happen at Clamp School, and the cause may be out of this world! The school is plagued with a series of mysterious vampire attacks and it is up to an enigmatic boy by the name of Kei to help put a stop to the attacks before the whole school is infected.

The main book is a light novel with short mangas at the end of each book. The novels are based on a role-playing game (Clamp Gakuen TRPG) sessions played by Game master Tomiyuki Matsumoto, Takeshi Okazaki, and Clamp members.