Yumi and her childhood friend have always taken each other's presence for granted, insisting there is nothing romantic between them. Everything changes when she asks him to help her win over his best friend Tomoki. Yumi and Tomoki become a couple, leaving him to recognize his feelings only after losing her, so he finds a girlfriend to bury his loneliness. Then Yumi begins to waver too, and the two childhood friends must confront the love they missed and decide where their strained relationship will go.