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Fifteen-year-old Ao Mizushima has always made the wrong choices. On her first day of high school, she decides to change things but ends up getting lost on her way to school and literally stumbles into a boy named Riku Hariya. He had just gotten into a fight with a friend, and when Ao comforts him, he asks her to be his fake girlfriend.

Ao refuses and runs off to school, where she sees a girl sitting by herself in her homeroom. Her name is Kiyono Soratani, and a girl wards Ao from befriending her, as rumors go that Kiyono snatches boyfriends. Ao befriends Kyono anyway and learns that Kyono was confessed to by a guy who already had a girlfriend and rejected him--thus starting the [[MaliciousSlander rumors]] that it was ''her'' who made a move on someone else's boyfriend.

Ao then meets Kai Midou, a popular boy in her class, who is the "friend" that Riku has been fighting with. Riku explains to Ao that Kai accidentally saw a photo of Riku, Kai, and Kai's girlfriend and assumed Riku likes Kai's girlfriend, and he broke up with said girlfriend shortly after. Riku wants to make amends and the only way he can think of doing so is by showing that he already has a "girlfriend"--aka Aoi. Aoi then decides to pretend to be Riku's girlfriend in order to help him fix his friendship with Kai.

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!!This series provides the following tropes:

* AmusementPark: Chapter 3.
* ChickMagnet: Kai.
* TheFaceless: Kai's perverted friend Yoshida. [[spoiler:Until Chapter 11.]]
* FakeRelationship: What starts off the plot--Riku asking Ao to be his fake girlfriend.
* FerrisWheelDateMoment: Between Riku and Ao in Chapter 3.
* IWantMyBelovedToBeHappy:
** In spite of liking Kai's girlfriend, Riku wants Kai and his girlfriend to make up.
** Kiyono keeps her feelings a secret out of the sake of her friendships with both Ao and Riku.
** [[spoiler:Ao breaks up with Riku and tells Kiyono that they were fake dating the entire time, knowing that Kiyono still has feelings for Riku and that Riku is not entirely over Kiyono.]]
* IndirectKiss: Riku purposely tries to invoke by taking a bite out of the same bread Ao did, but she shoves it all in his face before he can.
* LoveTriangle: Riku has a crush on Kai's girlfriend, and Kai broke up with her because of that.
* MeaningfulName: Ao means "blue" in Japanese.
* [[spoiler:OfficialCouple: Riku and Ao.]]
* PluckyGirl: Ao.
* RedOniBlueOni: Riku and Kai.
* TheReveal: Kiyono is Kai's ex-girlfriend.
* SchoolIdol: Kai.
* TallDarkAndHandsome: Kai.
* UnwantedHarem: Kai and Kiyono.

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