Lately, Satsuki's relationship with her husband has not been going well, and she has been feeling frustrated and troubled. Then she finds out that her younger sister has returned to her parents' home to give birth. Satsuki can't help but think about her sister's husband, Kentaro, who is left alone, and so she barges into his house. There, Satsuki shows off her white chest and sexy panties, teasing him, and in the end, she comes into his bath completely naked. Kentaro is seduced by the bold seduction of his sexy sister-in-law, Satsuki...