YuruYuri: Happy Go Lily

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.

A visit by a first year student inspires Kyōko to draw a doujin about her and Yui, prompting Chinatsu to respond with her own story, presented in a fearsome art style. They then decide to make some clay art figures. Later, everyone meets Yui's relative's child, Mari, with Chinatsu reluctantly dressing up as her favorite anime character for her.

As the girls travel to a hot spring inn, Akari dreams of being the popular and well admired main protagonist that she always desired to be. Once at the inn, the girls play some ping pong and relax in the baths before watching a Mirakurun movie.

Yui has a tough time getting Kyōko to concentrate on her homework. Later, the gang try and come up with nicknames for each other. Meanwhile, Sakurako attempts to catch a snake that is loose in the Student Council room. Later, the girls discuss how to prevent getting a cold, though Kyōko ends up getting a cold regardless.

Akari, Chinatsu, Sakurako and Himawari try to think of ways to pass time in class. Later, Himawari agrees to help teach Chinatsu to knit a scarf, which leaves Sakurako feeling lonely without her. As Valentine's Day comes and the girls give each other chocolates, Himawari gives Sakurako some Valentine gifts.

After Ayano becomes bothered by allergies during a high pollen season, the student council clean up their room, with Ayano having trouble keeping her special pudding away from Sakurako. Later, Nana ends up making various useless inventions when the student council just want their clock fixed. Meanwhile, the Amusement Club try to find ways to pass the time while waiting for the rain to pass.

As Kyōko realizes she needs to buy new batteries for her air conditioner, she gets distracted and ends up visiting everyone's homes, only to end up buying the wrong batteries after all. As she decides to have everyone go to the pool instead, Akari misses her train and tries to pass the time til the next one comes. Later, Kyōko visits Yui while she has a cold while Sakurako and Himawari follow Akari around.

The girls come to Comuket to help Kyōko run her doujin table, which is showing off a fan-made anime of Majokko Mirakurun in which Mirakurun fights against Team Giga Giga after they steal all the balls in the world. After selling out their stock, the girls go around in cosplay, where Chinatsu once again ruins the image of Mirakurun for young children. After Comiket, Kyōko brings up a box of conversation topics, including some weird ones.

Yuru Yuri's protagonist Akaza Akari here!! Yuri Yuri has returned to TV! Since summer vacation is over and school is starting, I hope to have lots of fun with the members of the Amusement Club! Now let's head to the club room!

S-Sugiura Ayano here! No one told me it was my turn to do this! I'm glad to be back here with everyone. I-I didn't come back here for you! But thanks for waiting! Huh? My mom's calling me. What could it be...?

Tada! Omuro Sakurako-sama has arrived! Has everyone been doing well? I'm always full of energy! Come to think of it, the other day I studied with Himawari. I think Himawari's... uh... b-breasts might have gotten bigger again... Argh! She even lectured me, too. Okay, I've got a good idea!

Hello, everyone. This is Akari's sister Akaza Akane. Thank you for looking after Akari. Akari's so cute. She's always such an angel. She's the apple of my eye. I could do this to Akari's that, and... Oh, excuse me. My friends are coming over today. I must get ready.

Ikeda Chitose here. I'm glad to see everyone again. Also, Ayano-chan and Toshino-san have already shown me so much already... It's great fodder for my fantasies. Oh, no. My nose is bleeding... No, wait. Today I have plans to go out with Ayano-chan! I'm so excited!

Yoshikawa Chinatsu here. Seeing Yui-senpai doing this and that, I'm just... overjoyed! I suppose I can let the rest of you take a peek as well! I've invited Yui-senpai to my house again today. I'd better dress myself up!