Chapter 1: Yamaguchi-san'chi no Tsutomu-kun
Mikako is a 15 years old girl who studies Fashion Design at Yazawa Gakuin. For all her life she has lived with her friend Tsutomu Yamaguchi. When they where two little children, older girls like to take him because there was a song called "Tsutomu Yamaguchi" and now that they are attending the high schools, any girl, included the older ones, are interested in him because of his resemblance with a popular idol: Ken Nakakawa of Mambo (An idol rock group very popular).
This really annoyes Mikako who is always complaining about this situation with her best frineds Lisa and Pi-chan .. those two are convinced that she loves Tsutomu but Mikako claims that he's only her childhood friend.

A day Mikako comes back home after school and she sees Tsutomu and Mariko - nicknamed Nice Body-ko because she's the most attractive girl of the school - kissing each others and when Mariko leaves, she slaps Tsutomu while he's trying to explain, then Tsutomu tries to stop her... Their quarrel go on even when they enter into the Blue Parrot, a pub owned by Hiroaki Tokumori, (who lives in their same building but upstairs). Tokumori is considered by both a sort of older brother, and he's used to be the peacemaker in Mikako and Tsutomu's "fights"
Anyway, while Tsutomu is at the bathroom Mikako leaves, and this gives the two men the chance to talk. Tsutomu reveals to Hiroaki what he really thinks about the entire situation: in his opinion a love affair with Mikako would never attain an happy end.

Meanwhile, Mikako finds a little black cat in the park and she falls asleep there with the cat. The dark comes and she hasn't come back home yet. This makes the whole family (Mikako's mother, Tsutomu, Tsutomu's parents and Noriji) go out to look for her. It's Tsutomu who finds her in the park and takes her home just like he did when they where six and Mikako run away from home because their parents were divorcing.
So, they all come back home and Ruriko and Mikako decide to keep the little black cat and Mikako decides to call him Kuro; Mikako apologizes to Tsutomu and they say goodnight to each other.

Chapter 2: Childhood Friends
Ruriko is a famous mangaka and her last manga "Futari no Fantasia" is a romantic love story; Mikako does not understands this kind of romantic things, and above all she cannot understand her mother who writes those stories.
It's another new day and Tsutomu and Mikako are on their way to school. In the street Tsutomu receives a love letter from an unknown and Mikako thinks that, despite all, he's a really good looking saru (monkey, that's how Mikako always calls him).
Before the lesson start, Tsutomu asks to Mikako is she wants to go with him to buy some food for Kuro and she accepts; but in the morning, Yusuke and Jiro, two of Tsutomu's classmates, convince him to go out all together with Mariko and some of her friends. The "nice" explanation of Tsutomu (I don't have time, I'm a very busy guy) makes her really sad and furious.
Late after Tsutomu, Yusuke, Jiro, Mariko and some of her friends are at the Karaoke All the girls seem to be only interested in Tsutomu, so Yuusuke force him to go away with Mariko. In the street he sees Mikako and Lisa and hides himself. Because of this Mariko asks him if Mikako is really only a childhood friend for him and then she proposes him to start a serious love affair with her.

The next morning, at school Tsutomu meets Mikako at school and they have another little fight about what happened the day before; Mikako doesn't accept the Tsutomu's excuses because she says that he'll go on doing like that even if he apologizes; Mikako thinks that going on like this they could never forgive each other and that this makes her really sad, then Risa says: "This means that a childhood friend can make one suffer like a love affair".
Meanwhile Tsutomu decides to start a serious love affair with Mariko and tells this to her.
Mikako's last thought is: "If this is what's like, then I don't want to fall in love. I don't think I could take it".

Chapter 3: Men
It's sunday and both Mikako and Ruriko woke up. Mikako discovers that the day before Tsutomu has brought some food for Kuro and leaved it at her place to apologize, so she decides to go to Tsutomu's. She apologizes for what happened and they decide to go out to buy some more food for Kuro; but at that moment the phone rings: it's Mariko who wants to see Tsutomu as soon as possible, and so Mikako undestands that they are going steady.

When Tsutomu reaches Mariko apartaments she doesn't even remember she has called him. They start talking about Mariko's first love and Tsutomu says that she's really cute without any make up. Tsutomu leaves and take Mikako to buy the food that Kuro likes; they have an umpteenth quarrel because Mikako is convinced that Mariko has no serious intention with Tsutomu and Tsutomu says that he knows that but he goes on watching over her.

Later, Mikako is at the Blue Parrot and she's talking with Toku-chan; Mikako is convinced that Mariko is making fun of Tsutomu.

The day after Mariko and Tsutomu take lunch together and so all the people at school realize that they are going steady and the gossips start to spread.
Mikako is forced to stay at school after the end of the regular lessons, and Lisa tells to Tsutomu and Yuusuke to wait for her. When she goes out, Mikako finds Yuusuke and Tsutomu wainting for her; then Mariko arrives obliging Tsutomu to take care for her until home and Mikako decides to go with Yuusuke; for the first time Tsutomu shows how jealusy he can be when someone other guy try to be too friedndly with Mikako.
Later Mariko makes Tsutomu note this, and she asks him if he's sure he doesn't love Mikako.

Meanwhile, Yuusuke is at Mikako's home, and she has cookeed an omelette for him. After then Tsutomu is coming home while Yuusuke is leaving and Yuusuke says to Tsutomu: "That girl, your childhood friend .. is really cute; do you mind if I try to conquer her?".

Chapter 4: Blonde Effect
Mikako changes her hair color from brown to blonde and reveals some part of her true self.
She uses to drastically change something in her when she feels bad, because this helps her feeling better.

Mikako's friends give her a positive response about her hair-color changing; but her mother is scared about this bacause she knows that this could be the sign that Mikako is suffering for something deeply inside. Meanwhile Jiro, Yuusuke, Mikako and Lisa organize a little trip to the funfair for the next sunday with Mariko and Tsutomu; Mikako decides to not worry about them anymore.

At the luna park Mariko and Tsutomu have a little quarrel and then Tsutomu is mistaken for Ken so he and Mariko run away; Yuusuke and Mikako are walking together. Tsutomu and Mariko take a ride on the ferrywheel and they start to talk about Tsutomu's real feelings for Mikako. They decide to break up and so Tsutomu leaves Mariko and looks for Mikako (who has been separated from Yuusuke because of the terrible mess at the funfair) and they come back home together.

Meanwhile at the Blue Parrot, Ruriko is still worried about her daughter and she tells to Tokumori that, when something in her life go the wrong way or when she's awfully unhappy, Mikako makes some great changes to her look to cheer up. Ruriko tells to Tokumori that, when she and Mikako's father decided to divorce, she made the hole in her ears for earrings all alone.

Chapter 5: The Favorite
Mikako thinks that Tsutomu and Mariko broke because of Yuusuke motorbike and Tsutomu says her that they broke because they both have a favourite; Mikako wonders who's Tsutomu's favourite. Meanwhile Yuusuke takes Body-ko home and she said that she wouldn't let him in her apartament or go out with him and when she get in home, she takes Shuu photo's and says: "I'm home Shuu-chan".

It's the last school day and it's tradition that every student go to school wearing the most flashing things they have and after the end ceromony the boys try to sell some tickets for a party that night. At the club while they are a moment alone, Mikako asks to Tsutomu why he and Mariko split-up and he says that he has a favorite too; Mikako thinks that he's only faking his strenght and feels sorry for him again.

During the spring holidays Tsutomu wants to take the driving license for the motorbike so decides to go away for a while to train. Mikako persuades her mother to buy a Cub for her and Tsutomu, because she wants to cheer up Tsutomu. When Tsutomu comes and finds that Mikako has brought the Cub is really happy and Mikako says that it would be used by him if he will take Mikako with. But Tsutomu cannot take anyone on the backside for a year ... and so Sally (the scooter's name) have to wait an year to be used because Mikako doesn't want that Tsutomu use it by himself. ^_^