Ep 1. Hydrangea

Wakatake Mari, a girl with a mysterious past was used to living alone with her grandmother but one day she is told she will be transferring to a girl's boarding school called Kaih? Academy. While she is in the cab traveling to her new school she sees a girl with long black hair standing on a rock in the middle of the ocean surrounded by sea birds. Mari is fascinated for a moment, but her hostility and melancholy over takes her again as she tours her new school.

Later Mari is introduced to her new school by the shy, Kouzuki Michiko who is in her class. She then meets her new roommate Senk?ji Hagino who shakes her hand, then immediately snaps and attacks Mari!

Later that night Hagino sneaks out and Mari follows her and learns a bizarre secret about her new roommate!