On a rainy day, Natsume meets a young girl youkai. Her name isn`t in the book of friends, but she wants his help anyway: she wants him to find a man she met once. The man couldn`t see Youkai normally, but a mischievous trick of the weather let him see her for just one day. For the next fifty years she visited him, hoping he`d see her one more time, but he never did. Now he`s vanished. Can Natsume find him for her?