ข้อมูลอนิเมะNatsume's Book of Friends 5 Specials

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. The two's sake cups are known for making any sake poured into them into first-rate sake, but after disappearing after only one night, come to be known as the "one night sake cups." The next day, Nyanko-sensei, who wants to drink more sake out of these one night sake cups, goes together with Natsume to visit the couple once more.