Four girls go about everyday life as they attend their second year of high school; a discussion of chocolate cornet begins; friends visit a sick Kagami Hiiragi; Akira questions her low pay.

During Golden Week, Kagami and Tsukasa have been playing together, but Tsukasa does not know her sister has been waking up earlier and going to bed later to study and finish homework; Konata pulls an all-nighter and decides to get a part-time job.

The girls discuss facts and myths about twins; Konata, Tsukasa and Miyuki compare notes on marriage; Konata, Tsukasa and Kagami try on ponytails; Minoru re-introduces Miyuki Takara.

Summer vacation is almost here and Konata is still staying up late playing online video games, reading manga and watching anime; Konata and Miyuki celebrate Kagami and Tsukasa's birthdays.

Konata, the Hiiragi twins and Miyuki go to a summer festival, dressed in yukata and Konata's cousin, Yui Narumi, is on patrol; Konata and Nanako chat over an MMORPG; Konata and the twins meet to do homework; Akira shares her insights on online games.

The group, along with Yui and Nanako, goes to the beach for some fun and spend a night in a Japanese inn; the twins have to clean their bedrooms and Konata discusses cleaning tactics with Kagami.