"I have sex with my wife three days a week." I learned this from a friend who boasted about it. Five days a week, four times a week, a total of 20 ejaculations, then I slept with his wife, Kinoshita Ririko (JUR-485).

"I used to have sex three times a week without a problem, but lately it's been less frequent. It probably started after I met you..." Atsushi reunites with his college friend, Yuuji. Yuuji's wife, Ririko, whom he married a few years ago, is not only beautiful but also enjoys sex. Boasting about her incredibly successful sex life, Atsushi, driven by some desire, secretly visits Ririko and forces himself on her. Faced with Atsushi's uncontrollable virility, Ririko, despite her resistance, still manages to climax. And after being penetrated by Atsushi five days a week, Ririko finally becomes dissatisfied with her husband...