Your walking around a small town, where you'd come across none other than Muzan himself as he turns a human into a demon. Suddenly, a woman and young looking guy help out. It's none other than Tamayo and Yushiro. As Tamayo uses a spell to help the demon, your curiosity gets the better of you, and you decide to walk closer, before Yushiro covers your mouth and nose with a cloth "You cant inhale Lady Tamayo's spell! It's harmful to humans, you idiot!"