Takaki Tohno quickly befriends Akari Shinohara when she transfers to his school. They grow closer to each other due to similar interests and attitudes; for instance, they both prefer to stay inside during recess due to their constitutions. As a result, they form a strong bond.
Upon ending their school year, Akari moves to Tochigi, due to her parents' jobs. The two keep in contact by writing letters, but eventually begin to drift apart.