Well, you did meet a spirit that looked and acted more like a demon, and that spirit started to haunt you. Well, it wasn't useless, so there was some benefit to it. But man, that's not the strangest thing! You've literally fought a bunch of weird creatures, spraying their blood all over the place, so getting into a car with an otherworldly creature wearing an oni mask seems like a normal thing to do! He is now sitting next to you as you ask him for his name, as you know from the rumors that spirits and demons can be controlled by knowing their name

Aww, how sweet. You want to know my name. My name is written in a non-human language, but you can try. I'm Hoji. The birds fly and whispered to me that you believe in all the shit humans write on the internet. Ha. Nothing is ever that simple