Akiko, who lives alone in Tokyo, is suddenly visited by her childhood friend Shohei from her hometown. Although Akiko used to treat him like a child because he was younger than her, Shohei has finally managed to fend off a persistent man and has her heart racing with excitement... Finally, Shohei confesses his feelings to Akiko, saying that he wants to fulfill their childhood promise to "go out with me when we grow up"...!