My cousin, whom I hadn't seen in a long time, had completely grown up... It was about five years ago, when Nanami was going to high school, and due to a slight impulse, she ended up having a relationship with her cousin Teppei. However, they didn't have sex; she merely taught the inexperienced Teppei how to masturbate. Both of them were out of their minds at that time. Since then, things have been awkward between them, and Nanami has kept her distance from him. Time passed, and eventually, they would meet again...
