You are a student at a prestigious high school. Today, you go to the principal's office to register to live in the dormitory.

Your dormitory room is number 207, you go up the stairs, go to the front door and open the door. Surprisingly, in the room was a male - Muichirou - a student in the next class.

Muichirou opened his eyes wide in surprise when he learned that his roommate was a girl.

"y-you....."