After Sena is caught playing an eroge and insists it's not perverted, Yozora has her read out the dialogue aloud to prove otherwise. Meanwhile, Kodaka's little sister, Kobato, feels jealous that Kodaka is spending more time with the Neighbors Club than with her. After encountering a swim-happy character in her game, Sena asks Kodaka to teach her how to swim. After the swimming lesson, Sena gets herself into trouble when she insults some guys hitting on her, forcing Kodaka to help her out. The incident reminds Kodaka of a friend he once had as a child, who taught him a lesson about friendship that Yozora strangely reacts to.

Kodaka meets 10-year-old teacher Maria Takayama, who was tricked by Yozora into becoming the Neighbors Club's advisor. Later, an effeminate-looking boy named Yukimura Kusunoki joins the club so he can study Kodoka and become more manly. Later, Kodoka saves a scientific girl named Rika Shiguma after she collapsed in the science room. Wanting to repay him in a somewhat sexual manner, Rika joins the Neighbors Club, where it is revealed she is also fascinated with curious dirty magazines.

Kodaka decides to start making healthy lunches for Maria, which makes Kobato jealous. Later, Rika has everyone try out a beta of a virtual reality RPG, which doesn't quite go as planned. After the game ends in utter defeat, Kodaka is surprised to see Kobato, who immediately clashes with Maria and decides to join the Neighbors Club so she can spend more time with Kodaka.