男優平井シンジ要去女友家暫住幾天好準備之後一起去旅行，沒想到被同樣在女友家的女友姊姊羽生ありさ的超魔鬼身材刺激之下，忍不住其誘惑硬上大戰的情節。 夫が単身赴任で身體のほてりを持て余していた人妻「ありさ」の家に妹の彼氏がやってきた。何もなく終わるはずだったが、無防備すぎるありさの肢體と爆乳に我慢できなくなった彼氏に言い寄られてしまう。ダメだと分かりつつも男ほでりの身體は性欲を抑えきれず…。妹の彼氏と濃厚に求め合った誰にも言えない不倫関係。 My sister's boyfriend came to the house of ``Arisa'', a married woman whose husband was working alone and was suffering from hot flashes. She was supposed to end up with nothing, but she couldn't stand Arisa's defenseless limbs and her huge breasts, and her boyfriend made advances on her. Even though she knows it's no good, her hot body can't control her sexual desire… She had an affair with her sister's boyfriend that she couldn't tell anyone.