A tiring week of work has passed, and the weekend break is also the time when Mika Hatori and her husband, along with her brother-in-law, drink champagne and chat about life. The husband, due to his low tolerance for alcohol, asks to leave early, allowing his wife to continue with her brother-in-law. As soon as that happens, the perverted brother-in-law starts to execute his plan with the enticing bait in front of him. He brings out a stronger type of alcohol and forces her to drink a lot. The naive wife happily drinks and chats with her brother-in-law without realizing he has ulterior motives toward her. Seeing that his wife is tipsy, the brother-in-law begins to make physical advances toward her, enjoying himself as he massages her round and firm buttocks. Hatori does not want to betray her husband, but it seems that alcohol has unleashed her inner depravity, so she not only does not refuse but enthusiastically serves her dear brother-in-law.