On a trip with his sister Tsubasa Hachino, the sister he has loved since childhood is about to go to her husband. He was sad that he was about to be separated from his beloved sister, remembering the times when the two of them had incestuous with each other, but the fun would end eventually. In order to hold on to those memories he had clumsily cheated on with his sister, he masturbated with her huge tits, and then fucked his sister.