Ouse Satsuki, a second year student of Sakurazono Gakuen receives one day on his cell phone a message from a stranger. The address of the sender is from a student on campus, but in the school there isn't any student with that name. Is the sender someone from the student council, or is it someone else?

Ouse Satsuki, a second year student of Sakurazono Gakuen receives one day on his cell phone a message from a stranger. The address of the sender is from a student on campus, but in the school there isn't any student with that name. Is the sender someone from the student council, or is it someone else?