Yuno had forgotten to do her homework in time for Yoshinoya's class and has to finish it during lunch break. After school, Yuno and Miyako play in the snow for a while and later visit Hiro's apartment so Yuno can thank her for the rice ball Hiro gave her for lunch.

Yuno and her friends have been given the task to create a new sign for the Hidamari Apartments, and they set to divide the work equally. Afterwards it is discovered that Miyako's rent is much lower than the others have to pay, and Sae goes to the landlord to discover why. That night, the summer festival starts and Yuno and her friends go and have fun.

Yoshinoya starts her class with her trying to get her students to sketch her in various outfits, but after some intervention from the principal, they settle on sketching a bust of Brutus. Later that day, the four main characters get together in Miyako's leaky apartment.

Today at school, Yuno and Miyako get to go outside during class to sketch something due to the weather being nice that day. Later, Yuno and her friends go to a karaoke bar where Hiro is determined to lose some weight while singing.

Yuno comes down with a cold and has to stay home for the day. While asleep in her apartment, Yuno has several odd dreams of school and of her friends. Meanwhile, Yuno's friends do all they can to help her get better.

Summer has arrived, and once final exams are over, Yuno and her friends enjoy the beginning of their summer vacation. Due to Yuno not knowing how to swim, Miyako gets out an inflatable pool that Yuno and her friends play in, though they eventually go to the beach.

A typhoon hits during the say of the Sports Festival and has to be called off until the next day when the typhoon has already blown over. Later on, Yuno and her friends are in Miyako's room worried that if the drying agents under her floor get wet they will ignite and catch the building on fire. Miyako gets the idea to remove them all, and throws one into the rain outside, but it does not catch fire.

Yuno and Miyako wake up early in the morning and as they are leaving the apartment building, Yuno spots an envelope on the ground. She notices a man not too far away and it turns out he had dropped it. To show his thanks, he gives Yuno four lottery tickets which were in the envelope. At school, a former student of Yoshinoya comes in to talk to Yuno's class, and Yuno starts wondering about her future dreams as an artist. Near the end of the day, Sae buys the evening paper to check the numbers on the lottery tickets, but no one is a winner.

The cultural festival is going on at Yuno's school, but the night before, Yuno had tried to finish a piece for the art gallery but ended up falling asleep before it was finished; Miyako took the painting and put it in the gallery by the time Yuno woke up. At school, Yuno gets praise for her unfinished painting even though she did not intend it to be this way and Yuno's friends all have parts in plays. Later, Yuno and her friends go to a public bathhouse and talk about the festival.

Yuno and her friends go to the zoo for a school assignment to sketch some of the animals. Yoshinoya dresses up like a tour guide and acts like one on the way to the zoo by pointing things outside the window to the students, but soon becomes very carsick and has to stop. At the zoo, Yuno and her friends go around and see many of the animals. Later, Yoshinoya ends up in front of the Hidamari Apartments, and Yuno and her friends take her to Hiro's apartment when she rests for a time. After she leaves, they discuss some of the rumors they have heard about Yoshinoya.

On Christmas Eve, Sae's younger sister Chika comes to visit and gets to meet Yuno, Miyako, and Hiro too. They show Chika around Yuno's school, and they run into Yoshinoya there who later swings by in a Santa outfit and wishes them Merry Christmas. Chika later comes to Yuno's apartment in the middle of the night after Sae refused to give Chika her autograph. Sae, Miyako, and Hiro come by too and they stay up late into the night. On Christmas day, Chika oversleeps and leaves quickly to meet someone in a neighboring town. Yuno and her friends spend the rest of the day together.