One day, Haruka Amou arrives as an intern student in the health and physical education department. The main character Souta falls in love at first sight with the cute and innocent Haruka.

Haruka tries her best to get through the training, but fails due to her own big-breasted complex. Souta sees this and offers to be her one-on-one practice partner.

Through repeated private lessons, Haruka gradually gains confidence. And of course, the two grow closer...