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.
So what's this youkai 
sealed in the stone like?
¿Quién es el youkai que 
fue sellado en la piedra?
¿Cómo era el youkai al que sellaron en esa piedra?
E como é esse youkai que está preso?