The protagonist came to a rural seaside town for summer vacation. There, he accidentally meets Aki, a yankee beauty from his class, and ends up sticking close to her in a lucky perverted situation, getting an erection.

As expected, Aki is furious. The protagonist, in desperation, forcefully approaches Aki, whom he had always seen as a beautiful, busty, and attractive person, and succeeds in getting her into sex! He melts and corrupts the virgin Aki, turning her into his onahole girlfriend to spend the summer with.

And so begins the best summer vacation ever, filled with fucking in the rural seaside town.