After dinner with Tsumugi, a mysterious designer from a client company, a married man whose relationship with his wife has gone cold sleeps with her. She melts his mind with deep kisses, licks his ass without being asked, and eagerly lets him creampie her over and over. The next morning she makes breakfast, puts on his socks, and services him with a blowjob without ever making demands. Captivated by this perfectly convenient mistress, he sinks deeper into an affair he never wants to end.