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Mao is trying to reach a burnt out light bulb, when Kyōya offers to help he winds up getting bitten. Megumi and Kyōya talk about Shoujo manga and it comes out that Mao can't read them. Shion plays against the world champion in chess online, who she easily beats. Due to a prank by Mao, Kyōya accidentally breaks a tea cup. Megumi proposes a punishment game for him and the other girls want to join in. Mao proposes a nickname for Kyōya, and her and the rest of the girls decide upon "Kyoro".

Shion, never having had canned coffee before, finds it weird. Mao has the habit of talking in her sleep when she has a bad dream, causing Shion to test a theory. Megumi tutors Kyōya in how to brush hair using Mao as a test subject. Shion reads a romance novel causing her to ask Kyōya a question. Mao challenge Kyōya to an arm wrestling contest where he has to beat all the girls for a prize. As a result he gets knocked out by Kirara and she receives the prize.

Kyoya calls Shion a genius and gets lectured on why she doesn't like being called one. Mao plays a prank on Kyoya which he falls into. On a later date Mao plays the same prank on Kyoya, which he falls into again causing him to sulk, making the girls feel bad. Kyoya sees Kirara talking with a cat. Mao finds an old TV that when booted up was playing a Tigers game which is Kirara's favorite team.

A marriage ceremony is preformed. A sweet potato vendor comes around, and the girls fight over the last one. The GJ Club discuss what they will do for the culture festival. Megumi, Mao, and Shion decide to dress up to tease Kyoya. Mori, the Amatsuka family maid, brings something Megumi forgot. Kirara and Kyoya dance, and Kyōya says something that embarrasses her.

Kyoya brushes Shion's hair. Kyoya tries to talk in a more manly fashion. Mao knits a big stocking for Santa. There isn't enough room under the kotatsu for everyone. Kyoya gets depressed when he doesn't receive any Valentine's day chocolate only for Mori to show up and give him some.

Kyoya is nowhere to be found in the club room. It seems he has taken the day off to do something with his younger sister. Furthermore, Kirara has her own younger sister, and Mao and Megumi have a third younger sister. Meanwhile, Mao suddenly invites Kyoya out, and she is clearly dressed strangely...

Spring. A new member is kidnapped while walking past the club room. The new club member's name is Tamaki.

In the beginning of summer, Kyoya's sister Kasumi comes to hang out in the club room. Mao convinces Kasumi she is younger than her and calls herself "Ma-chan". Meanwhile, the members of the GJ Club decide to go to the pool to escape the persistent heat... with Kasumi and her friends. The names of Kasumi's friends sound awfully familiar...

Kyoya is forced to wear a white coat. It seems today's club activity is playing doctor. The members of the GJ Club appear before Kyoya one by one as his patients. As Kyoya is getting used to it, he notices Kirara staring at something on the ceiling and grows concerned.

The autumn of arts. Kyoya is drawing something in his sketchbook. Mao thinks it is a monster, but actually... Just before Halloween, the sisters invade the GJ Club room!! Apparently, they have formed a middle school GJ Club.

Winter, the season of kotatsu and tangerines. Curled up inside the kotatsu is not a cat, but...

Even on the morning of the graduation ceremony, the members gather in their club room. At Shion-san's request, Kyoya follows her out to the vending machines... Once he returns to the club room, he receives a text while alone with Kirara... Finally, after school, the club's last activity together begins.