Mitsuko Ito and Junko Fujita are lovers. As they are passionately caressing each other's bodies, a phone call comes in. "Hello... Oh, it's been a while. What are you talking about? It's too late now. Say hello to your girlfriend for me." "Junko, who is that?" "An ex-boyfriend." For a moment, a look of unease crosses Mitsuko's face, but as if to dispel it, the two immerse themselves in their act again. ...That small ripple threatens to drastically alter their relationship...