"I have sex with my wife three days a week." This was a boast from a friend. I actually slept with his wife, Aoi Ichino (JUR-514), five days a week, four times a week, for a total of 20 ejaculations.

"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, Aoi, 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 Aoi and forces himself on her. Faced with Atsushi's uncontrollable virility, Aoi, despite her resistance, still climaxes. And after being penetrated by Atsushi five days a week, Aoi finally becomes dissatisfied with her husband...