連れ子のいる男性と結婚をしたゆうか。義息子・真一との関係も円満で表向きは何一つ不満の無い日々を送っていた。しかし淡白な夫との営みでは子宝に恵まれず、また自身も欲求不満で密かに悶々としていた。そんな時、夫が長期の出張となり、急に始まった真一との二人暮らし。最初は順調に過ごしていたが、少しずつ彼のスキンシップが増えてくると、ゆうかは妙な違和感を覚えた。気のせいだと見過ごしていたが、真一の行為はどんどん露骨になって…。

Yuka married a man with a ***** from a previous marriage. Her relationship with her stepson, Shinichi, was harmonious, and outwardly, she seemed to have no complaints. However, her husband's lackluster intimacy prevented her from conceiving a *****, and she herself was secretly frustrated and restless. Then, her husband went on a long business trip, and she suddenly found herself living alone with Shinichi. Initially, things went smoothly, but as his physical affection gradually increased, Yuka began to feel a strange unease. She dismissed it as her imagination, but Shinichi's actions became increasingly explicit…