Middle school students Futaba Yoshioka (Natsuki Deguchi) and Kou Mabuchi (Kaede Sakurai) find themselves drawn to each other after a rainy day. Whenever their eyes meet, they quickly look away, only to meet again. However, Kou suddenly transfers without saying anything. As they become high school students, Futaba, trying not to be disliked by her friends, starts to notice Makita Yuriko (Riko), who is isolated in class. Before Futaba, a boy similar to Kou appears, but he is called "Mabuchi".
At the end of the first year of high school, Futaba Yoshioka meets Kou Tanaka who was her first love. In their middle school days, they attended the same school, but he suddenly transferred to another school. Three years later, he appears in front of her again with the different last name of Kou Mabuchi. His personality also seems to have changed from warm to cold. He is like a totally different person from three years ago. Futaba Yoshioka slowly learns what happened to Kou Mabuchi for the past three years and she become to have feelings for him again.
