Yui and Kou have been childhood friends for longer than anyone can remember. As they became adults they also became lovers. They couldn't keep their hands off of each other, having sex in just about any place imaginable... including at school. Unfortunately for them a quite ugly bastard was in charge of the school cameras and decided it was time for some blackmail.

In order to protect her childhood friend and lover, she once again agrees to be his plaything. Taking everything from her, including her anal virginity.

It is the story of Yui, a schoolgirl who accepts sexual harassment from her perverted teacher to protect the dreams of her boyfriend, Kou. After Kou lost in a match, Yui was summoned by the perverted teacher and had to visit his apartment because of an agreement the two had made. Between humiliation, suffering and pleasure, Yui gradually became a mere lustful sex object.

Yui falls for her teacher’s relentless pleasure and becomes a submissive slut. As the summer is about to end, what will be the last decision she will make?