Yuuta Yamano and Shinomiya Natsuha are dating but he has no idea she is hiding a secret relationship that gives her more satisfaction than dating him. She reunites with her childhood friend and boyfriend Yuuta, rekindles their relationship, and they have their first sexual experience during summer vacation. Yuuta is surprised by how much Natsuha has changed and how skilled she is despite still being a virgin. Natsuha explains she learned from her friends how to have sex, but she isn't satisfied with Yuuta alone and continues secretly seeing Oga, a guy rumored to have slept with half the girls in school, turning it into a regular affair behind Yuuta's back. The episode ends with Natsuha reflecting that she'll return to Yuuta once she's satisfied, but for now she's sorry, leaving him unaware of the NTR betrayal