Asadera Karea is in the 2nd grade of high school. She has a boyfriend, but she believes he is unfaithful to her. Sekiya Koichi is a smart high school student. He sees a bluebird on a bench outside the school library. At that time, he is almost hit by Asadera Karea on her bicycle. Karea and Koichi barely talk to each other, but, while taking the bluebird to a veterinary, they develop a friendship.