Set in the beautiful natural surroundings of Boso Town, Chiba Prefecture, this heartwarming drama depicts the bonds between people connected by letters. Ryuhei Kaieda is a postman who takes pride in delivering letters quickly and reliably. Two years ago, he lost his wife and has been raising his middle school daughter Ayumi Kaieda and elementary school son Teppei on his own, but conflict arises between him and his daughter over her future education.