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?
How long are you going 
to stay in my territory?
¡No te quedes en mi territorio!
Quando é que você vai 
sair do meu território?!