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.
how you tell the difference
cómo se distingue entre un youkai para 
pelear y un youkai innecesario en la batalla.
como puedo diferenciar a los youkai a los que tengo que sellar de los que tengo que ignorar.