Three Naked Sisters: Lustful Intercourse

裸の三姉妹　淫交

Also known as 悶絶恋愛日記　濡れ濡れ三姉妹, Hadaka no sanshimai: Inkô, Tonari no sanshimai: Kainarabe, Tonari no sanshimai: Yari kurabe, 隣の三姉妹 貝ならべ

The youngest sister Miyo is an illustrator but she is a shut-in. She does not socialize with anybody. The middle sister Mizuki is working at a bar. She gives all of the money she earns to her boyfriend, who is actually married. One day, the oldest sister Hoshimi, who is a painter, returns home. Hoshimi brings different men to the house, and has sex with them. The two younger sisters are thrown off by her behavior, until they find the reason for Hoshimi's frustration.