The Ootoriryouran Academy is a highly prestigious private school well known for it's high academic standards, ruled over by two separate student groups—the Ryouran Association and the Student Council.

Katsuragi Shou is the Academy's newest student. He is greeted by fireworks and celebrations, but soon finds that the academy was oversubscribed. The male dorms are already fully occupied, and the only place left for him to stay is the all female Ryouran Dormitory.