Cage of the Succubi

One day, as our unfortunate hero was walking home, a demon stopped him on the road. - Without warning, she cast a spell on him, knocking him unconscious. When he awoke, he found himself in a mysterious castle. There, a maid explained to him that he was captured in order to serve as a demon's slave. Can our hero escape? - Or is he doomed to serve for the rest of his life?​