Episode 12

The Boar Bares Its Fangs, Zenitsu Sleeps

Tanjiro and Zenitsu end up getting separated inside the mansion, where the rooms rotate each time the tsuzumi drum is played. Without Tanjiro, Zenitsu is overcome by fear and despair, but he must protect Shoichi. Meanwhile, Tanjiro encounters the demon, the master of the mansion, playing the tsuzumi drums, and also a strange-looking man wearing a boar hide.