Accompanied by her mother, Yuno comes to Yamabuki Art High School to take the entrance exam. After getting accepted into the school, she settles in the Hidamari apartment and makes friends with the new neighbors.

Sae's little sister, Chika, has just passed a high school entrance exam. Meanwhile, the Hidamari residents realize that they also had a similar experience exactly one year ago.

March 16th-23rd: A male stray cat starts to live in Miyako's room. After a few days, however, the cat disappears from Hidamari apartment, making Yuno cry. October 31at: Yuno prepares for the cultural festival, the result of which is shown in the tenth episode of the previous season.

After visiting the Hidamari apartments, Chika chats with her friends and enjoys dumplings, which is her favorite dish. After that, they go to a karaoke box, but are soon disappointed that the place is closed for business. They instead head to a communal bath house, where they meet Yoshinoya and spend their time singing various songs together.

July 30th: Sae tries to finish her novel and goes to a café for an appointment with the monthly magazine editor. Before the talk with the editor, Sae confronts Natsume, in which Sae hopes Natsume doesn't find out about her profession. Afterward, Sae asks her friends whether any of them have experience of falling in love as she needed some inspiration for her romantic novel. In the night, Sae gives a phone call to Chika as she was apparently worried about her sister. November 11th: Sae and Hiro participate in a cooking class, where Hiro shows off her experienced skill in cooking. After the class, Hiro discovers Natsume in a flurry, buying a monthly magazine in which Sae's romantic novel, which was written during the first part of the episode, is published.

Yuno and Miyako attend the school entrance ceremony, in which Miyako falls asleep due to principal's tedious speech. Meanwhile, Hiro and Sae stay at the Hidamari apartment and they happen to meet with Misato and the landlady in the morning. After the ceremony, Hiro and Sae makes a surprise welcome party for the new Hidamari neighbors.

Students of Yamabuki Art High School, including Yuno and her friends, participate in a sports day event. Yuno's class under Yoshinoya represents the red team, while Natsume's class represents the white team. Later, the red team manages to defeat its rival, the white team. After the competition, Yuno and her friends together go back to their apartment and look back what they have done during the day.

August 5th: Yuno and Miyako's teacher, Yoshinoya, has to finish the remaining school works during the summer break under the Principal's watch. However, she keeps slacking off from her work as she takes photographs of herself, which will be used for the postcards that she will be sending out to the students. When Natsume discovers Yoshinoya in the school, Yoshinoya asks her to put some of the postcards in the mailbox of Hidamari apartment. December 3rd: Yuno and her friends goes out to watch a movie, which is directed by a Kishi who is a graduate from Yamabuki high school. After that, Yuno and her friends discover that Sae has received a letter from a fan of her literary work.

Yuno's class spend the day sculpting replicas of their shoes. Later, Yuno's parents make a surprise visit to Hidamari apartment.

In the early morning, Yuno makes onigiri bentos for Miyako and herself. When it is a lunch time, Yuno goes up to the rooftop of Yamabuki high school, which is prohibited area for students. After a brief assault of hungry pigeons, Yuno falls asleep on the rooftop. After the PE class in the afternoon, Yuno and her friends finds out that Hiro has been missing. When Yuno goes back to the dressing room to pick up the jerseys that she left, she hears a strange noise behind a door, where an unconscious Hiro is found. Then Yuno and her friends come to the conclusion that Hiro had stopped eating to fit into a tight pair of pants, where in actuality, Hiro had bumped her head on the low ceiling while putting them on.

After a small quarrel between Sae and Hiro, they have suddenly become antagonistic to each other. After noticing the tension between the two in the school, Yuno and Miyako tries to restore their friendship by inducing Sae to apologize to Hiro. Fortunately, their plan works out as Hiro accepts Sae's apology. Meanwhile, the landlady receives a bamboo trees as a present from one of her part-time job customer and she then decides to plant it next to the Hidamari apartment. After noticing the trees, the Hidamari residents celebrates Tanabata by putting up decorations on the bamboo trees and hanging small colorful papers with their wishes written.

Yuno returns to the apartments after going back to her hometown during winter break. The girls talked about what they did during the break and then decides to visit the temple after. On the way there they visited Yoshinoyo sensei's house and invited her to come with them to the temple. While they were at the temple they made New year wishes and then went home. After they went home they talked about all sorts of stuff like what they did last year and what they want to do this year.