Natsu ga Owaru made The Animation

Yui and Kou have been childhood friends for longer than either of them can remember, and as they grew up, their bond naturally blossomed into a passionate romantic relationship. The young lovers are completely inseparable, regularly indulging in intense intimacy anywhere they can—including inside their own school.

Unbeknownst to them, the staff member in charge of the school’s security cameras captures their risky encounters and decides to use the recorded footage for blackmail.

With no other choice to protect their reputation, Yui is forced to obey the teacher’s demands, knowing he will leak the explicit videos to the entire world if she refuses. However, as the secret encounters continue, Yui slowly begins to develop an addictive obsession with her blackmailer…