Shimai sōkan: Itazura na manyû

Original title: 姉妹相姦 いたずらな魔乳

Rena, a younger sister who is a shopping addict, tries to trick the men in the saffle and take over the debt repayment. However, among the men who are deceived by her cute appearance, her sister Yukiko's former affair partner Hiroshi appears in front of them trying to deceive her. Then, using Yukiko, whose feelings are solicited by reuniting with Hiroshi, she also aimed at her property. Rena notices it and struggles to prevent it...