Maou no Mama ni Narundayo!魔王のママになるんだよ！ ; Maoh no Mama ni Narundayo! ; I'm going to be the Devil's mama!

For a long time, humans were living in fear of the Demon Lord’s dreadful menace. However, at long last, a hero, who could successfully draw out the holy blade emerged and defeated the Demon Lord. Finally, the world will go back to its peaceful state once again… Or so everyone thought.