For the sake of the alumni association, protagonist Satoshi comes back to the town where he once lived. While walking in a nostalgic town, things of the past are recalled.

In the rural area town that is anywhere, Satoshi who spends ordinary every day. The appearance of Yukari which lives in the same town walks on the road is found, the interest springs up and he followed her. And in a vacant house that is among the mountain, the appearance of Yukari who is working hard at the masturbation is peeked.

Having peeked is finds out at once, contrary to expectations when it is angry, it is invited in the vacant house which overflows with erotic books.

Since then Satoshi and Yukari explore the lewd things at a vacant house everyday...