Can't resist the allure of my sister-in-law's round, big butt. Nao, a girl from the countryside who went to Tokyo after graduating from university. Because she couldn't find a job and had no home, she lived with her sister. However, at night, she became worried about taking over her siblings' assets. Since she was young, she had always been fascinated, so when her sister wasn't there, she wore a traditional dress and ran to where her brother-in-law was sitting reading the news.