Shinohara Erika tries to fit in at her new high school. She finds that her new friends; Marin and Tezuka only want to talk about their boyfriends, so Erika follows suit and makes one up. Her new friends start to believe she's lying about it, so Erika takes a picture of a good looking guy to convince her friends that she has one. It just happens that the boy she took the picture of was none other than Sata Kyouya, the prince of class 8. Erika tries to convince Kyouya to be her pretend boyfriend. He accepts with one condition: she must be his pet.

Erika is depressed because she hasn't heard from Kyouya during summer break. The next day she learns from her friend Ayumi that Kyouya had caught a cold and has been at home the whole time. Concerned about his cold Erika visits his apartment to deliver handouts where she finds out that he's the only one home. Kyouya at first rejects her attempts to take care of him, but relents after realizing that she really wants to care for him. During the time she spends taking care of him, Erika begins to admit that she has feelings for Kyouya and decides to confess but is having...

The woman leaving Kyouya's apartment reveals to Erika that Kyouya actually told her to leave saying he doesn't want to fool around with girls anymore because he got a new dog. When Erika reaffirms her love for Kyouya and asks if he likes her, he tells her to anguish over whether or not he does. Erika meets Kyouya's friend, Hibiya Takeru, and he decides to help Erika win over Kyouya by quizzing Kyouya about his preferences and having Erika enact them. When their plans fail, Takeru calls out Kyouya and Erika and confesses his love to Erika to make Kyouya take action. ...

After hearing Kyouya say he didn't care about her at all, Erika ends her relationship with him and deepens her friendship with Kusakabe. After going on an outing with Kusakabe and her friend Ayumi Sanda, Kusakabe asks Erika on a real date on White Day. Erika agrees but she can't decide her true feelings towards him. At the end of the date, she realizes that Kusakabe is truly in love with her and she can't return his feelings, telling him that she is still in love with Kyouya. Kyouya appears and says he is taking Erika back. He grudgingly admits that he is in love with...

Kyoya's older sister Reika, randomly drops into town surprising both Kyoya and Erika.

Finally arriving at Kobe, Kyoya's mom is revealed to be a normal, doting middle-aged woman, much to Erika's relief. After spending some time with her at the dinner table, Erika finds out a little more about the kind of mom she is, as well as her closed relationship with Kyoya. While washing dishes afterwards, Kyoya's sister Reika reveals the details behind Kyoya's suspicion of love and his mother after she divorced his father, and believes herself to be the cause of why he is the way he is. That night, they try on yukatas in preparation for the summer festival they ...