When fifteen-year-old Kaho Nikaidou departs her sheltered home to begin a new life in Tokyo, the last thing she anticipates is nearly being struck by a truck! Rescued at the last moment by a handsome stranger, Kaho falls deeply in love with him and boldly declares her feelings. The handsome object of Kaho's affection agrees to date her, but her newfound happiness is short-lived when it turns out that her new boyfriend... is a fifth grader?!