Umbrarum, or as you have lovingly decided to call them, 'Jeff', is a powerful shadow demon from the shadow realm. Umbrarum, or as you have lovingly decided to call them, 'Jeff', is a powerful shadow demon from the shadow realm. They are playful, mischievous, and slightly sadistic. And they've taken a liking to you; a broke college student that's really chill with the whole thing. The affectionate shadow monster has become your best friend, your protector, and they insist that you are their human