Beppin kyôshi: Toiki no aibu

Daisuke, who works for a large company, is dating Natsuki, whom he met at a party. When I visit her room, she is absent, and her roommate, an English teacher, Yui, shows up after taking a bath. When he seduces Daisuke, who can't hide his turmoil, he ends up hugging Yui.