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.

Months have past since Rihoko and Junichi have taken over the Tea Club. While it's already summer classes, Kanae is still annoyed that Rihoko has yet to confess to Junichi. While both of them are cleaning the Tea Club, Junichi reveals to Rihoko that he is suffering from heat fatigue due to eating only watermelons and noodles ever since his parents went out to help his injured uncle. After reminiscing their past of measuring each other bodies, Rihoko decides to cook dinner for Junichi and Miya to help with his heat fatigue much to his joy. As she goes out shopping, she reunites with Manaka and Ruriko who are selling cooked eels as part of their university project. After telling them what she is doing, Manaka and Ruriko give Rihoko some cooked eel to help Junichi's heat fatigue. As she heads to Junichi's home with her groceries, she encounters her classmate Makabe who asks her to follow him.

Makabe decides to leave Rihoko alone after hearing who she is in love and with goes after another girl only to embarrassingly realize it's Hibiki and Haruka. Junichi returns home after Rihoko arrived to cook dinner but feels awkward around her after he secretly learns she is in love with him. During dinner, both Junichi and Rihoko attempts to say what is on their mind but always gets interrupted by Miya. With the weather tonight raining, Junichi and Miya allows Rihoko to stay at their house for the night. As Rihoko takes a bath, Junichi looks an album containing both he and Rihoko when they were kids till the present and realize his feelings for her. Later that night, Junichi helps a sleepwalking Miya to the bathroom and meets Rihoko at the guest room. As they reminisces their past playing fireworks when they were children, both of them finally confess their feelings to each other. Junichi tells Rihoko he was always in love with her and never realize it until now.

Almost a year after they started dating, Junichi and Ai are reflecting over their time together at the beach. With Junichi studying at a cram school and Ai tending to her responsibilities as captain of the swim team and at home, they are spending less time together, though they are looking forward to their date on Christmas Eve. One morning, after Junichi studies too late, Ai goes to wake up Junichi and walks with him to school as they pass by Ai's teammates. After spending some time at the library studying, Junichi decides to visit Ai, only for the swim team, which includes Miya who recently joined, to reprimand him of his actions. Soon after, Junichi finds himself sleeping at the infirmary after another late night study session. Ai decides to visit him as Junichi asks her to let him sleep on her belly while singing him a lullaby.

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.

Kaoru is doing an MC of an Inago Mask show at the amusement park getting into her role as Junichi is playing one of the evil minions. After Kaoru starts deviating from the script which sends Junichi through the stage, he retaliates by attacking Kaoru with other bad guy costumes. Flashback to before the summer break, Kaoru is helping Junichi with a art assignment and helps him, rather suggestively by sitting on the chair he's in with everyone watching. Kaoru and Keiko talk about Kaoru and Junichi's relationship and how they looked too much like a couple during moments like that. Kaoru also begins to realize that even though they've been dating for almost half a year, their relationship hasn't drastically changed from before they were dating. After Keiko suggests that the two should go on a trip together, Kaoru and Junichi plan out a trip by getting a part-time job doing the Inago Mask show.

Junichi and Kaoru are picked up by a passing truck who's driver sends them to a nearby hot spring inn with a bus stop. As they both start to argue over who's fault for missing the bus, the truck driver comments and gives some advice for the couple. Arriving at the inn, both of them realize the inn looks haunted and with only both of them the only customers, Kaoru is scared of being alone that she asks Junichi to accompany her even at the baths. After having a meal and heading to bed, Kaoru confess to Junichi that she set up this trip as she wants to know where their relationship is heading but Junichi has fallen asleep. The next morning, Junichi learns he left his coin purse at the bus stop, leaving Kaoru to use almost all her money to pay for the inn bill. Both of them argue again with Kaoru blaming Junichi for being careless and him blaming her for on always buying limited-edition snacks, which both of them refuse to talk with each other to the bus stop.

It's been about ten months since Sae and Junichi have been dating and Sae's self-confidence has broken her out of her previously shy personality thanks to Junichi. Because of this, she is able to hold conversations with others, be more efficient with her job, and be around dogs owning one herself, though big dogs still scare her. This has also started to make her popular amongst the students as Junichi begins to feel threatened as his classmates are in disbelief that he is Sae's boyfriend. In response, Junichi goes all out to provide lunch for Sae only to hold up a line, get her favorite sauce picked out by the lunch lady, and to top it off, Sae herself comes to take their food to their table, thus he starts making more of a mental tab of what she likes. After going to the shrine where Sae made a wish, Miya tells Junichi that Sae is going to a hotel for a wedding meeting.

As Tsukasa helps prepare Sae with her duties for the Founders Festival, Junichi is feeling saddened by the lack of time he is spending with Sae as well as how he doesn't know how to help Sae. While reflecting at home, Junichi reflects with several tapes of Sae in his various movies when he gets an idea to film a documentary of Sae as the head of the Founders Festival this year. While filming, Sae begins to feel more pressure as the days go on but continues on. One day, Miya finds out that Sae is in the infirmary which Junichi rushes over to check. An awaken Sae explains to a worried Miya and Junichi that she was tired from working late at night and went to the infirmary to rest. Ten days before the Festival, Sae and her staff learns the Drama Club overspent their budget and don't have enough funds to buy costumes and recently learn the Swim Club and the Tea Club needs new equipment.

A few months have past since Haruka and Junichi have become a couple. During their date, Haruka asks Junichi when is he going to meet her parents which catches him by surprise. Haruka later reveals to Hibiki that she wants Junichi to propose to her during graduation day just like her British grandparents and her cousin, Jessica Morishima and her fiance did but doesn't want to force him. While Hibiki agrees to keep it a secret, she helps Haruka make Junichi ready subtly by helping the couple roleplay pretending they are getting married, having a baby and a family dinner with Hibiki playing the role as their daughter. But when Junichi won't answer Hibiki's question on how he propose to Haruka, Haruka is upset during their walk home but much to their surprise, they are greeted by Jessica who has come for Haruka's Graduation ceremony. Jessica is aware about Haruka's plans and tells her to tell Junichi soon before graduation.

Junichi is rather nervous of Haruka coming over as not only is she cooking for him but also staying over for the night as well which coincidentally his parents and Miya are out. As they go to bed, Haruka reveals she is leaving for England to be with her grandparents after her graduation ceremony which comes to a shock to Junichi. After confirming the story from Hibiki at school, he calls Haruka at her home only for Jessica to pick it up. Realizing what he's worried about, Jessica misleads Junichi saying not only Haruka will be leaving Japan and staying at England permanently but studying there as well and for Haruka's sake, he shouldn't speak to her. As Junichi walks around in town wondering what to do, he has an epiphany after seeing a wedding dress on display. On the day of the graduation ceremony, Miss Takahashi is surprise to learn that Junichi will be giving out the congratulation speech as the student representative instead of Tsukasa because he begged her.

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.

It's been two years since Junichi was stood up on Christmas Eve, which has scarred his heart and made him wary of love. While buying lunch for his friends, he helps Sae, a friend of his sister, Miya, which catches the attention of the popular school idol, Haruka. Later that afternoon, he goes to the library to meet his friend Masayoshi but encounters Haruka again and helps carry her books while she teases him before leaving with her friend Hibiki. Junichi's interactions with Haruka makes him believe in love again, so one afternoon he confesses to her. Haruka rejects him but she admires his honesty.

Because of Haruka's rejection, Junichi feels dejected and unable to sleep well. He goes to the infirmary to get some rest, but he unexpectedly finds Haruka resting there too. Despite what happened, Haruka is still interested with him which lifts his spirits up. After being dragged by Haruka into the school pool the next day, Junichi brings her to the library where he later confesses to her a second time. Unsure what to say, she allows him to confess to her again as many time as he wants and kisses his eyebrow.

Ever since the kiss, the energetic Junichi has attracted the attention of the girls which makes Haruka jealous. He asks her to kiss him on the eyebrows again but instead she brings him to an abandoned water pump shed where he kisses her behind her knees like a puppy. Junichi wants to kiss her that way again and keep asking her for the next few days. After taking Hibiki’s advice on what to do with their relationship, Haruka lets Junichi spoil her including both of them engaging in some roleplay with him feeding her ramen, much to bewilderment of everyone in the cafeteria. Later that night, Haruka thinks how much fun she had with him.

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.

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.

As Kaoru is in denial about her feelings for Junichi, she gets into a fight with Keiko’s crush upon learning he made fun of the letter she wrote to him by showing it to his friends. Junichi stops her and follows her to the rooftop, where they talk about Keiko's romantic problems. Their conversation turns to their own relationship, which hasn't changed much. She plays a joke on him and accidentally kisses him which was both their first kiss. Wanting payback for what happened, Junichi brings Kaoru to the library to tickle her. Unsatisfied, he changes his mind and kisses her navel instead. As the two walk home while laughing at what they did, they help two boys retrieve their stuck birdie on a tree. As Kaoru rushes to her part-time job, Junichi realizes he's finding her cuter than ever. Later, while Kaoru is on her way to work, she sees her mother meeting with an unfamiliar man.

The next day, Kaoru doesn't come to school, worrying Junichi. Skipping the rest of the day's classes, he frantically searches for her at the places where they hang out, until he takes a clue from overhearing Hibiki and Haruka, and looks for Kaoru at her part-time job. When he confronts her, she reveals that she spent the night at a manga café after she had a fight with her mother over learning she is dating another man and thinking about remarrying. She is against it, being content with the way things are with her mother. Junichi counsels Kaoru about her problems, promising to be there for her when she needs him. She in turn admits she needs his companionship. The next day, Junichi is glad to see her at school in her usual self again, after she and her mother have talked things over.

Noticing the growing attraction between Junichi and Kaoru, Masayoshi and Keiko decide to set the two up together by making them meet at the infirmary. There, Junichi tries to ask Kaoru out on a date on Christmas Eve, but to his surprise she has already planned to go out with him. On Christmas Eve, Kaoru decides to bring Junichi to the top of the new Port Tower despite his fear of heights. As they watch the snow fall, Kaoru confesses her love to Junichi, admitting she wants them to be closer. He in turn admits he loves her as well, that he wants to be with her forever, and they kiss. When Kaoru misses the last bus home, Junichi invites Kaoru to his home to stay for the night where both of them sleep together. Ever since, Junichi and Kaoru have become a loving couple.

Junichi, still afraid to love due to a traumatic event that happened two years ago, sees a beautiful new student named Sae Nakata. He gets to know her eventually when he goes looking for her to properly thank her for finding his wallet, and his sister Miya eventually introducing him to her. That afternoon, when Junichi sees Sae being scared by a "big dog" and panics, Junichi takes her to the restaurant where Kaoru was working to calm her down. It is here that she gets enamored by Kaoru's uniform, and, saying she wants to wear one sometime, Junichi suggests to her that she takes a part-time job there. Junichi and Miya try to train her on how to become a waitress based on Kaoru's tips. With Junichi as her instructor, her training is off to a tough start, given her mistakes. Still, Sae finds a friend in the Tachibana siblings.

Sae's training to become a waitress continues with the help of Junichi and Miya, by practicing her speech skills and practicing how to change uniforms in three minutes--where Miya catches her, in a swimsuit, and Junichi in a compromising position when Sae tripped. They even have had special training in a hot spring with some doctor fish in it to further her speech skills. Sae expresses to Junichi her desire to train even harder, though he has little idea why she wants to be trained more. Her trainings did make Sae become closer to Junichi and Miya; however, one night when Sae has to sleep over at the Tachibana residence, Junichi tells her his wish that he would like to have another younger sister like her, but, to his surprise, she says doesn't want that.

Though confused as to what Sae told Junichi that night, her training goes on until the day of the job interview. She passed it, but when Junichi plans to "graduate" her, she refuses, stating that she wants to become her student forever. Junichi is happy to see Sae in her part-time job, though still confused with her. One day, Junichi accompanied Sae to the amusement park, where they rode the merry-go-round and watch a hero show. Here, Sae asks Junichi to call her by her first name, as well as asking him to be her partner for the upcoming Best Couple Contest during the school festival. Later, taking a clue from Sae's actions, Junichi holds her hand.

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.

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.