Anyamal Tantei Kiruminzoo episode 11

It aired on Monday, 14 December 2009.

Endless pounding thumps in the dark?

The winter break's just begun, and today everyone gathers at Riko's house to have a party. When Ken invited me to come, Kanon, invited by Ken, brought a Vladonian-style snack. Kanon also starts looking for the secret of Riko and the others in the Mikogami house...