Nanami Takahashi is a high school student entering her first year. Immediately on her first day however, she becomes the victim of a practical joke by the school's most popular guy, Motoharu Yano, who coincidentally also ends up in her class.
Nanami Takahashi begins her second day at her new high school, making two new friends in her class, like the shy Yuri.
On a class trip, Yuri gets sick while Nanami and Yano have a conversation about his past.
It is summer vacation and Nanami goes to school for the play rehearsals, but she's pretty annoyed that Motoharu doesn't turn up to any of them.
The Cultural Festival draws near and all the students are hard at work preparing for the event.
Following Motoharu's confession during the Cultural Festival, Nanami seems pretty out of it as she couldn't sleep at all last night.
Nanami is thinking about the things she's enjoyed with Motoharu but "crossing the line" is the one thing she still cannot do.
Motoharu asks Nanami out on a date but she blows him of to secretly buy him a present, but it isn't much of a secret because he follows her.
In her room, Nanami uses this opportunity to ask Motoharu about his past Yuri and it takes some time for him to give her answer.
All alone with Motoharu at his house, Nanami actually suggest that they finally "do it."
Without thinking Nanami steals an old picture of Motoharu together with Nana, from Yuri's knocked over bag and she's doesn't know what to do about it.
Nanami and Motoharu's study session in interrupted when, out of the blue, Yuri turns up on Motoharu's doorstep, with something to tell him about her sister.
In an unconventional way, Motoharu finally confesses to Nanami, the sin he committed to Yuri.
The relationship between Nanami and Motoharu has ended and a week has passed without even as much as a word between them.
With things going nowhere between Motoharu and Nanami, Takeuchi is unable to hold back his feelings and decides to take the initiative.
Preparations for the annual Cultural Festival are progressing smoothly but what hasn't progressed is Nanami's relationship with either Motoharu or Takeuchi.
It is the night of the school festival and everyone is anxiously waiting for the main event.
It's a normal school day, following the school festival and Nanami decides to get back together with Motoharu but under the condition that he tells her all about his first love, Nana.
After some thinking Motoharu decides to tell Nanami all about Nana, so he invites her out.
Nanami is finally able to accept Motoharu and they get back together and as if nothing happened they return to their normal school lives.
It is another day of school but that quickly comes and goes when Takeuchi is forced to go along on a double date with his classmate.
Nanami's parents are going to a wedding on the weekend, so she takes this opportunity to invite Motoharu to sleepover.
Knowing that Nanami is left, hopelessly waiting for Motoharu, Takeuchi gives in to his feelings and goes to her to take her home.
Motoharu tells Takeuchi that his Mom is getting a divorce and will be moving to Tokyo and while they're out Takeuchi feels the need to tell Motoharu that he confessed his feelings to Nanami.
Christmas is already around the corner and Nanami is still worrying about a present even though she hasn't made up with Motoharu.
Nanami is also worried about the impossible entrance University exams she has gotten herself into and she is begins studying like mad, in order to raise the chances of being accepted.
Christmas is only a few weeks away however Nanami and Motoharu may not be able to spend it together as he's decided to follow his Mom to Tokyo.
