Shidou is a demon, who lost his powers after people captured him while visiting earth. Being a demon, the people wanted to sell him on the black market with other creatures. Shidou doesn't trust humans, he hates them after they captured him..

Sae was walking through the black market when suddenly his eyes hit an interesting sight. It was a demon, tied in chains and having a muzzle on his mouth. Shidou seemed to be struggling under the chains. He was growling at the salesman.

“Unchain me, stupid human..”