Ichijou Hotaru is enjoying life with her classmates at her new school. In particular, she has come to think of the diminutive Koshigaya Komari, at less than 140cm, as her “cute Senpai.” This feeling soon grows into absolute adoration. Then, one day, Komari calls Hotaru and invites her to hang out together…

Natsumi gets chewed out by her mother over her poor school grades whilst also trying to hide her poor test results from her. Afterwards, the girls visit Hotaru, who attempts to hide the vast number of handmade Komari plushies in her room. This ultimately fails, but she manages to pass them off as part of a school project. Later that night, the gang have a test of courage at the shrine, which proves a bit too much for Komari.

After sleeping through the New Year, Renge joins Kazuha, Hikage and Kaede as they decide to go up a mountain to watch the first sunrise of the year. Along the way, Kaede recalls five years ago when she was first asked to look after the one-year-old Renge, initially finding her to be quite a handful but soon taking a liking to her. They eventually manage to reach the top of the mountain and watch the sun as it rises.

As Spring arrives again, Hotaru and Komari go on a picnic together, where Hotaru ends up eating Komari’s botched up homemade lunch in order to not hurt her feelings. Later, the girls get together to search for some edible plants, eventually coming to a field of renge flowers where Natsumi makes a costume for Renge.

Renge, who is about to start first grade, goes with the others to check out the school before the entrance ceremony, before seeing Hikage off as she goes to Tokyo. The next day, as Renge and the others enjoy the entrance ceremony and begin their first lessons, Hotaru starts moving in.

Hotaru is finally getting used to how kids play in the country, although she’s still afraid to jump off the bridge into the river. Hotaru returns home from playing to find a letter from her friend in Tokyo, with a photo of her old friends at an amusement park, making her feel nostalgic. Meanwhile, Hikage is home for a visit and shows off pictures of Tokyo Tower to Renge.

One morning during winter break, Ichijo Hotaru and Koshigaya Komari are on a walk when they run into Fujimiya Konomi on her way back from practice. Komari takes great interest in Konomi’s cellphone.

An OVA bundled with the tenth manga volume.

On a Winter day, Hotaru has fun creating all kinds of things with the snow, which end up triggering a chain reaction of mishaps for Komari. During Spring, Hotaru goes to the candy store by herself and ends up making cookies with Kaede. On the last day of Summer, the girls use various senses to try and give Komari a pleasant dream. Finally, during the Autumn, the girls go to the woods to collect fruit, where Komari comes up against a flying squirrel.

Sometimes it’s hard to believe Hotaru is still in elementary school! But even Hotaru needs to act like a kid now and then… or at least that’s what Konomi thinks.

Beep boop! Koma-plushie is live, boop beep! But Hotaru isn’t a master of robotics just yet, and her pet project still has a long way to go before it’s ready to fly.

Following a graduation ceremony, Renge and friends spend the day playing in the great outdoors. It’s days like these you wish would never end…