Mahiro, a newbie instructor and idol at the gym, was secretly dating her coworker when they were caught by their senior. He threatened to expose them unless she agreed to his demands. Not only that, but he also forced her to give swimming lessons while wearing revealing bathing suits, which constituted sexual harassment. Despite being humiliated and covered in shame, Mahiro found herself increasingly aroused by the situation...

新人インストラクターでジムのアイドル的存在のまひろ。内緒で付き合う同僚と仕事終わりに愛し合っていたところ先輩に盗撮され、それをネタに●されてしまう。さらに卑猥な水着姿で水泳レッスンを強要されるセクハラも受ける彼女。瑞々しい肉体を視姦凌●され恥●にまみれるも、次第にそれが快感に変わってゆくのだった・・・!