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.
However, if I do this any more I shall 
turn into something evil myself.
Pero, si sigo cazando más youkais, yo 
mismo me convertiré en uno malvado.
Sin embargo, si continúo haciendo esto, yo mismo me convertiré en aquello a lo que extermino.
Mas, se eu continuar com isso, 
posso acabar me tornando maligno.