Demon Slayer: Kimetsu no Yaiba Episode 12 Info:
Title: Something More Important Than Life
Description: Inside the house, where the rooms spin each time the tsuzumi is played, Tanjiro gets separated from Zenitsu Agatsuma. Without Tanjiro by his side, Zenitsu is overcome by fear and despair as he takes Shoichi through the house. Meanwhile, Tanjiro meets the master of the house, the tsuzumi-playing demon, and an odd-looking man wearing a boar’s head mask.
You may watch episode at the official links provided below =