In Hell Keeper you play as a bastard prince, son of the demon king Malakaris, and a the human queen, Anne. After a curse that was holding you back was broken by a forest witch, your true demonic form was released. You captured the witch and together with your best friend Lily, went towards the ancient fortress of Malakaris, there you found allies and an opportunity, an opportunity for a better life and the chance to become the new King and restore the empire of demons. Capture women and corrupt them, make them loyal to you and create your harem, pillage and plunder villages, grow your army and take your revenge on the king who destroyed your life.​