I haven't even kissed my classmate's boyfriend yet... I guess I look serious... but the truth is I'm into older men... no, actually, I'm into older men... Tachibana Hinano
Hina, a female student, had been maintaining a pure relationship with her boyfriend Yugo, yet secretly harbored fantasies about older men. Despite her well-behaved, studious appearance, she felt unfulfilled in her relationship and became deeply immersed in masturbation. One day, her neighbor Koji came by with a community notice and entered her room. That night, she experienced sex for the first time. From then on, Koji's friends began getting involved one after another, and Hina gradually descended into a life of promiscuity.