My cousin whom I hadn't seen in a while had grown up completely... This happened five years ago. Nanami, who was going to school, ended up having a relationship with her cousin Teppei due to a small incident. However, they didn't have sex; she only taught Teppei, who didn't know anything about women, how to masturbate. Both of them were not in their right minds at the time. Since then, things became awkward, and Nanami had been keeping her distance from him. After that, time passed, and they ended up meeting again...
