The Rejected Husband is the Demon Lord

A woman marries a struggling janitor only to escape a wealthy suitor, then discards him without a second thought. Her circle openly ridicules the man she rejected, unaware that he is secretly the Demon Lord whom every demon bows to. Locked inside a haunted manor and selected as a sacrifice, he begins to feel his sealed strength stirring back to life. The question hanging over the story is what the world will do once he recalls who he truly is.