Hanabi Yasuraoka é uma aluna do 11º ano. Ela se sobressai na sala e é muito aplicada. Mas guarda um segredo com Mugi Awaya, um rapaz do mesmo ano. O amor é realmente algo belo? Esta é uma história de amor para os mais puros e perturbados.

Enquanto Hanabi e Mugi mantêm a sua relação falsa, uma rapariga observa-os atentamente. O seu nome é Noriko Kamomebata. Para esta, Mugi é o seu príncipe encantado desde criança. Recusa-se terminantemente a acreditar que ambos namoram. Enquanto isso, Sanae Ebato, a melhor amiga de Hanabi, também tem suas dúvidas quanto ao relacionamento de Hanabi e Mugi.

Sanae is over at Hanabi's house for a sleepover when she comes out and asks Hanabi about her relationship with Mugi. After Sanae corners Hanabi on her bed to get the truth about Mugi, she steals a kiss...

The school's music teacher Akane Minagawa may have a squeaky clean image, but there is another side to her as Hanabi finds herself being manipulated by Akane. Just when Hanabi thinks she doesn't have anybody she can turn to, Sanae appears before her...

Hanabi is consumed by feelings of inferiority and loss as she blames herself for her own incapability after she sees Narumi confess his feelings to Akane. Meanwhile, Akane is irritated with Narumi for not making any moves after his confession until she hears something he says...

"I had sex with Mr. Kanai." Akane's bombshell lights a fire in Hanabi, and she vows to fight back. Meanwhile, she tries to go back to being friends with Sanae, but...

Moca finds herself going out on her first date with Mugi, even though she knows that he doesn't really have feelings for her. She's dreamed of going out on a date with Mugi for so long. Moca tries to convince herself that it's the happiest day of her life, but...

Summer break is here. Hanabi and Mugi both decide they will confess their feelings to their crushes after they complete their summer homework assignments. They are beginning to realize that they can no longer view each other as 'replacements' for their crushes as the time to confess their feelings draws near.

Hanabi and Mugi made a promise to see each other again after they confessed their feelings to their respective first loves, but Mugi never showed up. Not soon after, Hanabi accepts an invitation from Sanae to go on a trip to Karuizawa with her.

Hanabi and her own weakness has hurt Sanae. Before leaving Karuizawa, the two of them make a promise to become friends again someday. The new semester begins, and despite telling Akane his feelings, Mugi is still letting her toy with him.

Mugi is her student since her tutoring days. Narumi is her colleague she only became interested in after she discovered Hanabi's feelings for him. Both men have fallen for Akane, but she still feels unfulfilled.