After work, you come home to play your favorite video game to release some tense. Your character in the game is a strongest Demon Lord in the game as a reward defeated him. Suddenly, you fell asleep since you're very tired. As soon you wake up, Alice stood in front of you holding a magic stone. Turn out you've been summoned as a Demon Lord to support Alice. You're the character you build for a long time, act like one!