Junichi decides to ask Haruka out on Christmas Eve. While asking her out, both of them realize that they have met before on Christmas Eve last year and cheered each other over their respective problems. Haruka refuses Junichi's offer, but instead invites him to her family's Christmas Eve party. On Christmas Eve, Junichi and Haruka decides to relax in the hotel swimming pool before meeting her family but when her family can't make it, she invites him to her hotel room. With the two of them alone, Haruka reveals her insecurities to Junichi as she has fallen in love with him but thinks he is no longer interested with her. Junichi hugs her and assures her he hasn’t and both of them declare their love for each other. Ten years later, Hibiki visits Haruka and Junichi, now a happily married couple.

As Junichi decides to tell Sae how he feels for her, Sae invites him to a restaurant that serves a special parfait--one that could allegedly turn a couple into lovers by eating it. On the day of the Best Couple contest, however, Haruka and Hibiki wins first place--although Junichi and Sae, in wedding attire that she designed and sewed herself, comes in a close second. She puts the blame on herself, but Junichi says she's cuter than Haruka. Their prizes are tickets to a movie, and they get to watch it in a private room. While Junichi is in the bathroom, an English-speaking man sees through him, as to his plans for Sae, and tells him not to be afraid of failure. The man was revealed later in the pamphlet Sae was reading to be the director of the film they are about to watch. After the movie, Junichi gathered his guts to tell Sae that he likes her. This made her happy, and they became lovers from that very moment.

Rihoko tries her best ice skating with Junichi, unaware that it’s a part of Kanae’s plan to get them together. At school, while Rihoko sends in the Tea Club’s application for the Founder’s Festival, Junichi meets Manaka and Ruriko and helps them carry a kotatsu to their club room. Manaka and Ruriko convince Junichi to help the Tea Club during the Festival and hopes he joins their club as well. On the night of the festival, the Tea Club, wearing Kimonos, serve tea and sake for their guests while Junichi and Rihoko head out and distribute recruitment fliers. After the festival, Rihoko and Junichi go home together where she gives Junichi his Christmas present. Since he has nothing to give her, Junichi grants Rihoko a chance to ask him any favors.

Despite the cheerful atmosphere going into finishing work for the Founder’s Festival in time, Junichi is sad about Tsukasa, and plans to ditch the festival again. But when Masayoshi reveals to Junichi about a girl he never got to confess at grade school, he tells Junichi not to make the same mistake as he did, inspiring him and regaining his composure. At the Festival's after-party, Junichi asks Tsukasa for some time alone, and confesses to her. But when he says that he loves her no matter what her personality is, she, confused and angry, beats him up, telling him she erased the old her for him before crying into his arms when Junichi expresses how glad he is to know the Tsukasa he loves still exists. Miss Takahashi catches the two but decides to leave them alone. Tsukasa later tells Junichi that she began organizing the Founder's Festival as a childhood dream to become Santa Claus herself to make people happy but now realizes she's doing it for her own fulfillment.

Tsukasa sees Noriko about to kiss a panicked Junichi and angrily drags him to the Janitor's shed which Noriko believes her plans have work. Instead, Tsukasa kisses Junichi to calm him down, revealing she was aware it was a trick by Noriko to cause a rift between them and makes Junichi promise not to fall for Noriko's tricks or kiss any other girl than her. On the day the candidates give their speeches, Junichi and Tsukasa's supporters give Tsukasa a sash with their signatures and supporting words for her. As she goes on for her speech, Junichi comforts a nervous Tsukasa who goes on to give an inspiring speech to the students. Tsukasa wins the election by landslide while Miya and Ai celebrates Sae getting second place and overcoming her shyness at a Karaoke bar. Noriko, distraught by her loss, vows to her friends she will beat Tsukasa and steal Junichi from her in the next election. On the way home, Tsukasa and Junichi encounter a stray dog chasing them.

At the Founder's Festival, Miya and Sae's class is doing a play of Romeo and Juliet with Miya and Sae as the lead characters respectively while Ai is working at the Girl's Swim Team Oden Stand. When she gets her break time, she reflects on last year's Founder's Festival with Junichi and starts to tear up wondering how Junichi's doing. After the Founder's Festival ended, Miya and Sae invite Ai to a slumber party at Sae's place, but before they could go, Ai forgets to get her brother, Ikuo, a present for Christmas. She finds an Inago Mask belt toy at the store, bringing up memories of her time with Junichi again as she stars tearing up again, feeling lonely that she can't spend this time with her boyfriend. But then she hears a familiar voice and turns to see Junichi behind her who snuck out of camp to spend his Christmas with Ai. They call Miya and Sae to tell them that Ai's not coming and leaves Ikuo's gift at his bedside as they go on their long awaited date.

In the episode, Junichi hasn't gone around with any girls yet. Miya goes to a hot spring with Sae and Ai. There she meets Tsukasa, Rihoko, Kaoru and Haruka. The main characters except Junichi enjoy girls' talk in the hot spring.