【Mio】 of the swimming club is dating 【Takumi】, a male from the same school's cultural club. Just sitting next to him makes her heart feel like it's going to burst with excitement. Holding hands, kissing... all of it was like a fresh page of youthful romance. Nagi, who had been living such a happy everyday life, was sexually harassed by her swimming club advisor [Mr. Ooki] during practice—having her breasts groped, her vagina fingered, and her penis grabbed—and ultimately, she was even forcibly penetrated. However, she got hooked on the technique of a married teacher's dick and sex — every week, after school in the pool, she fell into an affair relationship—
