There is an urban legend that if you manage to take a picture of the person you like and keep it as your cellphone background for three weeks things will go well between you and that person. When, Makoto Ito has fallen for a girl that rides the train with him every day to and from school he attempts the legend. While trying to keep his secret a fellow classmate Sekai Saionji discovers the picture the first day and decides to help him win over the girl he likes Kotonoha Katsura. However, unbeknownst to him Sekai actually has a crush on him.