Natsume is going home for the last time, but first he must stop by his relative’s house to get the key.  But he is cautious, as inside is a youkai that tormented Natsume, and a girl that has always resented him.
Youkai like that foster 
darkness in human hearts
Esa clase de youkai, cría 
la maldad de las personas
Esa clase de youkai introduce la maldad en los corazones humanos,
Esses youkai alimentam as trevas no coração dos humanos