In the spring of her fifth year, Calmia Vermillion remembers. This world is strikingly similar to the otome game "Anemone Days." She was the notorious "villainess" destined for terrible endings in all routes of that game. And that, in her previous life, she was a charismatic Demon Lord who commanded demons.

"Hah, what's this 'promised doom' you speak of? I am the Demon Lord! A mere inability to use magic is a trifle."

"Oh, so you are my fiancé...? Very well, you shall address me as the Demon Lord! Revere me! Kneel!"

"...Wait, what is this? I don't get it."

The story of a former Demon Lord, now a young lady, who, by doing as she pleases, somehow becomes popular with everyone around her. ...Or so it seems.