Anyamal Tantei Kiruminzoo episode 21

It aired on Monday, 1 March 2010.

Beyond the shadow of the demon cat?

When Riko and her family arrive at the Nekomata hot spring, they hear that the ingredients for the hot pot they were looking forward to have have been stolen, and begin a search for the culprit. Inaba, the innkeeper, says it was the work of a giant cat specter called "Nekomata"...