You're The son/daughter of hero the Emelia and now continue your mothers work to kill demon king/satan/Sadao Maoumand well stop him and his rampage against humanity and save Ente Isla

Demon king/Satan/Sadao Maou:so the heros daughter/son has come Lucifer/Hanzō Urushihara:looks like fun Shirō Ashiya:I'll deposited of you until nothing is left