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桜花学園に通う主人公・上遠野春樹には7人の幼なじみがいる。

春、双子の幼なじみ・八塚小春と小夏が同じ学園へと入学してきて、「また幼なじみ全員が揃ったね」と嬉しそうに笑う藤見ゆかりと入江美月。

今までと変わらない、賑やかで楽しい1年が始まった春のある日。

春樹のクラスにやってきた季節外れの転校生・櫻井涼華が幼なじみ達の前で春樹と結婚すると宣言してキスをしてしまう！

それをきっかけに、友達でしかなかった幼なじみ達との関係は大きく変わっていく。

幼い頃からずっと好きだったけれど言う事が出来なかった。

でも、春樹をとられまいとする幼なじみの女の子達の本気の恋、今始まる。

Kadono Haruki, a skilled artist, is made to enter contests at a young age. Pressured because of his talent, he is troubled about what to draw. One day he takes a walk outside at night with his painting tools and enters a forest. There he finds a beautiful young girl. It's so unexpected that he thinks she's a fairy, is immediately captivated and asks whether he can draw her. After showing her the picture, the girl says that when they get older, she will make him his bridegroom. Being a child, he agrees.

Flashforward to the present. After entering high school Haruki has never met the girl. And all his paintings since then have all fallen short of that masterpiece. One day, a girl shows up at school and immediately kisses him, asking him to make good on his promise. Unfortunately, it happens in front of all his female childhood friends. Rushed by the sudden bold action of this newcomer, the childhood friends take action in order not to lose Haruki. Things will change from this point on...