After successfully concluding an important business deal, Aoi and Hasegawa decide to hold a celebration at Aoi's nearby house. There, Hasegawa is greeted by Aoi's wife, Rena, who has magnificent large breasts, and he can't help but salivate at the sight. As the night goes on and the drinking increases, the two drunk men end up arguing over something trivial. They manage to avoid a fistfight at the last moment, but Hasegawa, Kokoro of Aoi, goes to sleep with Rena while still drunk...