恵美はある日、美人で人気者の姉への告白電話を受け、思わず電話を切ってしまった。高校に入学した恵美は、何という偶然か、その電話の主と出会ってしまい…！？　あふれる愛の鼓動。 One day, Emi receives a call with a confession to her popular and beautiful older sister. Without thinking, she hangs up. But on the day that she enters high school, by some unknown coincidence she meets this caller who had confessed over the phone... And thus, an overflowing love begins...