On the night when he was stood up, a heartbroken Junichi is about to go home when he meets his friend Kaoru. To cheer him up, she invites him to her home to eat cake with her and her mother. Two years later, they remain friends who snark at each other. After punching him and bringing him to the infirmary, Kaoru asks Junichi to come to the flower garden after school. Thinking she wants to confess to him, he instead finds Kaoru with her friend Keiko, both asking advice about Keiko's crush. He suggests writing a letter to him. As the two of them go home, Junichi tells Kaoru of what he thought she was going to do at the flower garden, which leaves her flustered as she heads for her part-time job at a restaurant. As she tries to forget about the incident, Junichi arrives at the restaurant, making her nervous every time she sees him. Figuring out why she is acting strange, she in turn realizes that her feelings for him have grown.

On the night when he was stood up, a heartbroken Junichi heads home and meets a young girl rushing home with a present for her brother. Two years later, Junichi and Masayoshi heads home where Junichi encounters the girl he met two years ago, now with a cold attitude. At school, Junichi chases after a black cat Miya talks about and meets the girl again who teases him and introduces herself as Ai Nanasaki, his sister’s classmate and member of the Swim Club. Miya later asks Junichi that night about why Ai wants to know about him, but he ignores her, causing Miya to write on his forehead while he’s asleep. The next morning, Ai helps Junichi wipe off the writings on his forehead and helps him enter the raffle Miya wanted him to enter. Despite not winning the prize Miya wanted, Junichi and Ai decide to use their prize, a 500 Yen voucher, to buy some Ōbanyaki and later pick up the trash at the beach.

Still in pain after being stood up a year ago, Junichi decides to skip the Founder’s festival when Masayoshi catches up with him and invites him at his house. A year later, Junichi decides to change himself, and he starts by volunteering as Tsukasa's assistant for the Founder's Festival committee, to everyone's surprise. Junichi is amazed with Tsukasa's work ethic and the work she does. While being locked in the storage room, Junichi tries to get to know more of Tsukasa until Miya and Sae arrives. On their way home, Junichi meets her older sister Yukari on the way but Tsukasa shows displeasure and hurriedly excuses herself and drags her sister home. The next day, despite Tsukasa being busy substituting swimming classes for Kaoru and Keiko, she is able to help Junichi deal with problems concerning the festival. Later that afternoon, Junichi finds a notebook on the classroom floor. As he tries to find the owner's name inside it, Tsukasa, still in her swimsuit, suddenly arrives.