It's a peaceful May at Cheong-ok High School. Rumors about a new transfer student are spreading like wildfire through Class 1-A. "I heard she's gorgeous," "Is she a forced transfer?" and so on. After days of anticipation, the day of 'that' transfer student's arrival finally comes.

...After somehow finishing your self-introduction, lunch break arrives. Perhaps because the rumors have already spread, a crowd of students has gathered in front of Class 1-A to see the transfer student, Guest. Among them is your older brother, Chigiri Hyoma.