As Akari Akaza enters middle school, she decides to join the Amusement Club alongside her friends, Kyōko Toshinō and Yui Funami. They are later joined by Akari's classmate, Chinatsu Yoshikawa, who originally intended to join the now-defunct tea ceremony club, but is convinced to join the Amusement Club. Noticing Akari's lack of presence, the girls try and come up with ways of improving her personality.

The student council president, Ayano Sugiura, shows her annoyance at always placing behind Kyōko in tests, while her assistant Chitose Ikeda fantasizes about the yuri potential between the two. Meanwhile, two classmates, Himawari Furutani and Sakurako Ōmuro, are at war with each other as they are both vying for vice-president position. Ayano later gets a cold so the others pay her a visit.

With Yui now living alone in her own apartment, she invites the others over for lunch. After Akari and Chitose leaves, Kyōko decides to spend the night only to remember she hasn't finished her homework.

The girls write Tanabata wishes, with Kyōko becoming annoyed at how Chinatsu's wish is responded to by Yui. Ayano studies fiercely to reach the top of the final exams, only to become disappointed to find Kyōko hadn't studied due to the exams conflicting with a doujin deadline. Later, everyone heads to the beach, where Ayano's attempts to be more friendly with Kyōko prove to be near fatal for Chitose's imagination.

Ayano unwittingly gets dragged along by Kyōko, Yui and Chitose to a doujinshi convention in Tokyo to help Kyōko sell her dojin. Himawari and Sakurako work on their summer homework, where Sakurako talks about why she joined the student council. Meanwhile, Akari and Chinatsu have a confusing conversation about the latter's feelings towards Yui, which leads to Chinatsu practicing "kissing" on Akari against Akari's will just as Yui and Kyōko walk in.

With Christmas coming up, Kyōko holds a lottery to arrange the girls into pretend couples for mock dates. Kyōko and Chinatsu go to the movies and the arcade, Akari and Chitose visit some cafés, Himawari and Sakurako go to a restaurant while Ayano and Yui just sit around talking about their friends. Later, the girl's spend New Year's at home where they check their greetings cards from each other.

On April's Fools Day, Chitose decides to play a lying game with Ayano, who later discovers that all of her supposed lies were actually true. Later, Kyōko tries to get the attention of Chitose, only to discover it to be her twin sister, Chizuru, who doesn't particularly take too kindly to Kyōko.

The girls try to find way to distract themselves from the Summer heat. While visiting the student council room for some cooling comfort, they meet the silent student council president, Rise Matsumoto, who they mistake for a spirit. Meanwhile, the science teacher, Nana Nishigaki, decides to do her experiments in the student council room.

Kyoko and Yui, along with Ayano and Chitose, go on a school trip to Kyoto, where they explore the town, have a bath together and engage in a pillow fight.

Akari, Kyoko and Yui reminisce their childhood days when they were being bullied by a certain pink-haired girl. Later, a bump on the head causes Kyoko to become uncharacteristically polite. The others soon begin to miss the old Kyoko, especially when Kyoko plans to disband the Amusement Club, so they decide to hit her on the head again to return her to normal.

Everyone decides to have a sleepover at the clubroom during the summer. Kyoko arranges a contest between the Amusement Club and the student council. After everyone has some barrel baths, Chitose goes on a kissing rampage as a result of eating chocolate.