Hyuuga Ippei is a self-supporting university student. He has to work part-time to finance his studies so he does not have spare time to spend for summer sports, Romance, refreshing summer retreat, not even summer festival.

"During this summer, I want you to tutor my granddaughters living in the countryside beach," his professor ask along with the promise of good salary and accommodation. It is also a good opportunity to enjoy summer, on top of that, those girls are known to be cute.

"I'll do tutoring! Please let me do it!"