18+ Kanojo ga Separate wo Matou Riyuu

Amane Kojou, a virgin girl frustrated with her chaste boyfriend who only kisses her, channels her energy into the track and field club. However, her strong sexual desire, typical of an athlete, fuels her growing frustration. To make matters worse, a middle-aged man can’t stop staring at her provocative athletic uniform.

Living alone in an apartment, Amane indulges in nightly masturbation. Unbeknownst to her, the middle-aged landlord secretly records her behavior!

In exchange for deleting the videos, he demands a one-sided physical relationship.

Though unwanted, Amane’s unsatisfied body begins to crave the man’s touch more and more… What will become of Amane?!

(Source: AniDB)