On a train ride to school, Makoto Ito, a first-year high school student, takes notice of Kotonoha Katsura, an attractive schoolmate who he finds commutes with him. Infatuated with but unable to approach her, he sets his cellphone wallpaper with her photograph as a charm, content with watching her from afar. During the rearrangement of homeroom, Sekai Saionji, his new desk partner, notices the picture, and offers to help get the two of them together...