Freelance swimming instructor Kijima Gunzou receives a request.
It was to give swimming lessons for FruiCHU ☆ Daughter, an idol unit of beautiful girls, who he is a big fan of himself!
Gunzou's plan was to hide the fact that he's a fan and get acquainted with the girls in respectful manner, but the girls' charming bodies keep driving him crazy.

What lies ahead when things get out of control...?

[Translated from DMM]