Natsume is at home early one evening when he hears a knock on the door.  He sees Tohko outside, asking to be let in.  But when he opens the door, there's nobody there, and a gust of wind rushes past.  Another Youkai is after the book of friends!
I knew that humans and youkai 
could not be together,
Sabía que los humanos y los 
ayakashi no podían mezclarse, pero
Sabía que la relación entre un humano y un ayakashi es poco menos que imposible,
Eu sabia que humanos e youkai nunca poderiam ficar juntos,