"Three days a week, having sex with my wife." 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, Minami Kojima (JUR-519).

"Lately, I've been having sex with my wife less often, and her reaction time is worse than before. It's really boring..." Atsushi reunites with his college friend, Yuuji. Yuuji's wife, Minami, whom he married a few years ago, is not only beautiful but also seems to actively enjoy sex, and he's been praised for "marriage is wonderful." Atsushi, with his excessive libido, feels resentful. Then, he secretly visits Minami and forces himself on her. Faced with Atsushi's uncontrollable brilliance, Minami, despite her resistance, still manages to climax, and after being penetrated five days a week, Minami finally feels dissatisfied with her husband...