Fumino Nakayama works as a tennis instructor at a tennis school and invites her student, Kyoko Harada, to her home. Although a tennis lesson was scheduled, instead of rackets, adult toys were prepared. In truth, Nakayama is a lesbian who had planned to give Harada a sexual lesson at her home. Through carefully orchestrated moves, Nakayama gradually draws Harada into her world. Beyond the boundaries of everyday life, a hidden passion begins to bloom here.