Childhood F(r)iends 1: Nono's First Time

Nono has always secretly liked Takeru, who she's known since they were kids. When she hears he has a girlfriend, it puts her in a blue mood for the rest of the day, which Takeru notices, spurring her to confess. But there's a secret hidden in Nono's body that she isn't aware of, and her first time will trigger a mysterious transformation…