Komichi Akebi has been accepted into Roubai Academy, the middle school her mother, Yuwa, went to. Komichi has dreamed of wearing a sailor uniform ever since she saw her favorite idol, Miki Fukumoto, wearing one. She puts on the brand-new sailor uniform Yuwa made for her and, at last, heads off to her entrance ceremony. She starts out full of hope that she can make lots of new friends, but then she notices that all the other students are wearing blazers. It turns out the school's official uniform has changed from a sailor uniform to a blazer...

Her first self-introduction to her class. Her first school lunch. To Komichi, who never had any classmates throughout her elementary school years, these were all new and fun things. As she eats lunch around joined desks with Erika Kizaki, Touko Usagihara, and Tomono Kojou, a song by Miki Fukumoto plays during the school's lunchtime broadcast. When Touko learns that Miki is Komichi's role model, she hands Komichi a tube of lip balm and asks her to imitate Miki's music video...

After Komichi completes the fifty-meter dash with the fastest time in her class, several athletic clubs try to recruit her, but Komichi can't decide which club she wants to join because there are too many things she wants to try. Following a random turn of events, she exhanges contact information with Kei Tanigawa, the brightest girl in the class, who is also having trouble deciding which club to join. Komichi still hasn't reached a decision when Tomono, who has decided to join the literature club, offers to visit all the different clubs with her. At last, Komichi makes up her mind...

Komichi makes up her mind to invite Erika over during the weekend. But because she's never invited anyone to her house before and doesn't know how to ask, a week has passed before she realizes it. Erika, realizing that Komichi is acting suspicious, invites her to the school library to try to find out what's going on. Komichi takes an interest in the book on fishing that Erika is reading and tells her that she often goes fishing at the lake near her house with a her own homemade pole. Erika responds with a look of envy, and from there...

Midterm exams are finally over, leaving some students overjoyed and others depressed, and now it's time to decide who will participate in which events at the school's upcoming athletic festival. Riri is selected as the anchor for the swimming event, but Erika nominates Komichi for the same position, so the two girls compete to determine who will be the anchor. Riri is a member of the swimming club, and once made it to nationals in elementary school, and Komichi feels no desire to compete against her as rivals. Then Riri proposes that if she wins, she and Komichi should swap uniforms...