12-sai.: Chiccha na Mune no Tokimeki

キス・キライ・スキ

コクハク

At Yui's household the bath broke and she has to take bath at Hiyama Bathhouse. Even though she decided not to fall in love, she starts having feelings for Kazuma Hiyama. At the same time, another boy confesses to her, though Yui politely turns him down, saying that she likes someone else. He responds by mysteriously touching her arm. Later, Kazuma gets into a fight with the boy who confessed to Yui, and Yui seeks to find out why. Another girl tells Yui that the boys have been touching the girls arms because one of them said that the arm is as soft as the breasts. This girl says that the boy who confessed to Yui started asking people if they wanted to know what Yui's breasts feel like. She reveals that that's why Kazuma fought with him. Yui realizes that Kazuma was only trying to protect her by fighting, and goes over to the Hiyama Bathouse to confess her feelings to him, where she learns that he likes her as well.

Wデート

Yuuto asked Hanabi to go out with him. His girlfriend convinces him to take Yui and Kazuma along with them. The two couples go on a double date at the mall.

トライアングル

Class 6-2 has a new student: Hanabi's childhood friend who has just came back from Tokyo, who starts having a crush for Hanabi, despite seeming to be a bit of a bully.

バースデー

Hanabi and Ayumu go shopping to get a present for Yuuto's birthday, after which Hanabi will go on a date with Yuuto and give him his present. Ayumu purposefully makes her late for the date, and tries to tell her that he likes her, but is interrupted by Yuuto. Due to a misunderstanding, Hanabi ends up thinking that Ayumu hates her, which depresses her, because she had grown to want to be his friend.

ボーイフレンド

Ayumu tries to take Hanabi away from Yuuto. They wind up in a race. Cocoa, who wants to be Yuuto's girlfriend, decides to help Ayumu win. Can Hanabi and Yuuto discover the truth?

ハジマリ

After Kazuma asked Yui to walk her home, she thinks what does she like him for. The answer finds it's begin in previous year...

ナマエ

Hanabi and Yui try to address Yuuto and Kazuma by their names, and to make the boys do the same. In the end, only Yui and Kazuma manage to, when Hanabi and Yuuto couldn't.

トモダチ

Due to a misunderstanding, Hanabi and Yui fall out with each other and won't speak to each other for the next few days. In the end, Hanabi reconciles with Yui while defending the later from other girls from another school.

オリヒメヒコボシ

With the Tanabata coming along, Hanabi's homeroom teacher asked the class to write something nice about their classmates in their Tanzaku in hopes that it will strengthen the bond between boys and girls in the class. Meanwhile, Cocoa plans to sabotage the relationship between Hanabi and Yuuto again by borrowing the boys' camera to make group picture of herself with Yuuto, which fails.

ナツコイ

After accidentally hitting Yui on the head with a football during the gym lesson, Kazuma invites her to a pool date as an apology and they invite Hanabi and Yuuto. However, Eikou and his pranksters overhear the girl's conversation and on the day of the pool date, they keep spoiling the couples' time and mood, so it's up to Kazuma to chase them away.

ハナビ

// Hanabi = fireworks. But title is written in katakana, so it is ambiguous (since name of main heroine is Hanabi too). With Yui's cram school lessons and Kazuma's work in his family's bathhouse, Hanabi and Yuuto are left to go on a date at the summer festival. Even with Eikou and his pranksters and the other girls keeping the couple apart (which turned out to be Cocoa's plan to separate them), Hanabi and Yuuto manage have a good time at their date and see the fireworks together. After the fireworks Yuuto managed to take the courage and say Hanabi's name through a recording toy rabbit, much to her joy and each other's embarrassment. Meanwhile, another boy from Yui's cram school takes an interest in Yui (foretelling something unpleasant in the next season).