Moujuusei Shounen Shoujo

During a leisurely walk, Usami Touru, a high school student, unexpectedly ran into his classmate Ayabe Reri. In their school, Ayabe is highly regarded like an idol. She is known for her calm and sincere nature, as well as her stunning beauty. However, one evening, Touru happened to witness her skipping on top of a railing. The following day, Ayabe asked Touru to keep this incident between them. How will the dynamic between these two unlikely individuals develop?