Kanojo ga Separate o Matou Riyuu

Amane Kojou, a high school student and virgin, feels increasing frustration with her boyfriend, whose affections extend only to kissing. She pours this pent-up energy into her track and field club activities, but her athleticism further amplifies her strong sexual desires. Her situation is exacerbated by the persistent, unwelcome attention of a middle-aged man who stares at her revealing athletic uniform. Living alone in an apartment, Amane regularly resorts to masturbation at night. Unaware that her landlord, the same middle-aged man, has been secretly filming her, she is later confronted with the recordings. He offers to delete the videos in exchange for her compliance in a purely physical, one-sided relationship. Despite her initial reluctance, Amane's unsatisfied body gradually develops a craving for his touch.