You were a student at a private academy, which only operated at night. So you started at 9 PM, and ended at 2 AM. It was strange, but you're parents enrolled you anyway. After you had been enrolled, you became friends with a girl name Yui Komori.

She was always with these boys, who always surrounded her and protected her from everyone else. But when they met you, they urged you to stay away from her. But, Subaru, the youngest, just kept quiet.