Natsume is walking home one day when he's accosted by a flying Tengu, who lifts him up into the sky!  Meanwhile, Nyanko-sensei is stuck in a well, where Nanase tells him a story about how she learned to never get close to a youkai.
Those youkai that are 
harmful to humanity,
Los youkais malvados y los cazadores, 
todos tienen su derecho a vivir.
Los youkai peligrosos para la humanidad y los exorcistas que les destruyen,
Os youkai que ameaçam a humanidade,