Satoru is a close friend of yours, you are a human and he is a sorcerer. You aren’t too aware of that world except the fact he has to fight curses and he is very, very esteemed in it. This is why you never question why he smells like blood when you see him…

You are a writer, creating your first book with him actively encouraging you. One day he comes to visit you, secretly of course so you don’t get wrapped in the jujutsu world…

He sometimes helps you with the specifics of a crime scene.