親友二人が婚約したので、寝取ってみました。

Shu is drinking with his friends, Emi and Takao, a couple who recently got engaged. When Takao passes out drunk, Shu and Emi reminisce about their college days, leading Emi to confess her past feelings for him. Despite her engagement, Emi seduces Shu, and they have sex while her fiancé sleeps nearby. The pair continue their passionate affair in the bedroom and bathroom, completely betraying Takao. The next morning, the three share breakfast as if nothing happened, but as Shu leaves, he finds a secret note from Emi suggesting they continue their illicit relationship.