Yuu Isshiki, a first-year college student, has a charming girlfriend, Karen Mitsumoto. However, one day Yuu discovers that Karen has an adventure with her Senpai, Kamokura Tetsuya. Angry, sad and desperate, he calls Kamokura's girlfriend, Sakurajima Touko, from which she is said that she is the most beautiful girl in the institute. "Touko-senpai. Please, have an adventure with me. " But Touko said: "I can not let me fool me. I have to push my opponent at the bottom of despair. " Her's plan is then to continue falling in love and, finally, to break it as the night with another man.

Para hacer el cuento corto, Yuu el protagonista se entera que su novia Karen lo está engañando con un Senpai que a la vez es novio de la Chica más hermosa de la Universidad, cegado por la venganza, este la contacta y juntos idearan un plan de como vengarse.