Kyosuke moves to Tokyo for university, leaving his hometown girlfriend. He gets entangled in an affair with a married woman living nearby, caught in an immoral love triangle as he struggles to choose between the two relationships.

Katagiri Kyosuke, who moved to Tokyo from the countryside to attend university, is in a long distance relationship with "Sacchan." However, by chance he ends up having a physical relationship with the married woman who lives near to his apartment. Thus begins a story surrounding an immoral love triangle... Kyosuke, who doesn't understand love, must choose between a girlfriend from his hometown or a married woman in the city. What is the fate of this destructive love affair? Based on a manga by Iori Asaga.—Drama-Otaku