As a high school student, Hotaru Hinase has great family and friends but little luck in love. One day, she hands her umbrella to Hananoi, a high school classmate who has just been dumped. This small gesture then leads the boy to ask her out on a date. What is love? What does it mean to be in love? Hotaru is unsettled to suddenly be invited to start a relationship with this person, who nevertheless turns out to be very caring.