Mizuno's sister-in-law and her husband asked to stay at her husband's brother's house for a few days due to family matters. Here, she always found ways to seduce her husband, perhaps because she was too bored having to make love to the same man for so many years, felt bored and wanted to change to something new, so she did so. As for the older brother, he's 35 years old and still doesn't have a wife to take care of him and hasn't experienced what it's like to make love, so when he sees her doing that, he feels very excited and lustful. increasingly boiled over from here. It was a fateful Sunday night, the three brothers held a small party on the weekend. Of course, the party was indispensable for beer and wine. Due to his poor tolerance for alcohol, the husband collapsed immediately afterward, seeing an opportunity. The lustful sister immediately took advantage of her brother-in-law's sexual advances. While climaxing, her husband woke up, so she had to serve him again. But that didn't stop her from giving up. Secret stories between the two brothers started happening the next morning - when the husband went to work.