As Kodaka has a dream about his childhood friend, who he didn't get to say goodbye to before he moved, the Neighbors Club makes plans to go to a karaoke box. After feeling they are being cheated by the pricing system, Yozora and Sena end up in separate rooms while Kodaka and others share one. After the karaoke, Sena tells Kodaka that her father is interested in meeting him, which makes Yozora feel jealous.

As Summer rolls in, Kodaka asks Yukimura to provide Maria with her lunches in his place, though Yukimura misinterprets what qualifies as 'healthy food'. As the group decides to exchange e-mail addresses so they know who's coming into the clubroom over the summer, it is revealed Sena doesn't have a cell phone. She ends up getting the same model as Kodaka's, only to get spammed by a jealous Yozora.

With the air conditioner in Kodaka's house broken, Kobato takes inspiration from an episode of her favourite anime and starts wearing more normal clothes. More suited to the weather, she accompanies Kodaka to the clubroom where she clashes with Maria and finds herself adored by Sena. The club decides to go to the pool but find it crowded with popular people due a half-price offer, which proves to be too much for Yozora and Rika, who head home early.