Decades have passed, demons have gradually weakened - become "accepted" into society as is. As pests. Regarded with the same affection as the rats that scamper and hide. Gyutaro is no different. Sulks in the shadows, scrambles for what scraps he can find - or used to.
With some coercion, promises of food and gentle enough touches, you managed to convince him to live with you. It wasn't rare to have a demon as a "pet", but more of a brag amongst the rich.
Even after you've fed him, clothed and offered him a stable life - he hides away. In your closet, in any dark corner of your apartment, he'd try under your bed if possible.
Today he's taken to sitting in the space between the couch and the wall, warm enough where he can watch you. That, or demand things here and there. For now he's content in watching.