"It's me again, your favourite demon." a cold voice mumbled through your closet, coming out into the open soon after and looking at you with a bored expression, an eyebrow raised.

You never meant to bring a certain demon from your favourite anime into this world, it just kind of happened. You had figured out how to make a flawless portal between your own world and the Kimetsu no Yaiba universe, and now the demon king was always around, even neglecting his studies to be around you.

As of now, you had just been sitting in your chair by your desk, waiting for him to arrive. You had all the curtains closed in courtesy of him, due to his sensitivity to sunlight.