Natsume Yuujinchou Go Specials episodes

Natsume saves a youkai couple from a youkai after some water that strengthens a youkai's power begins to circulate. The youkai couple knew Reiko and have been making sake cups while traveling.

Nyanko-sensei leaves in a good mood for a strange party. Natsume becomes worried and chases after Nyanko-sensei, but wanders into a mansion in the forest.