Demon King Atler seeks to conquer the Magical World. It's up to magical girl Melul to stop him.

Two million years ago, Bat Mel, the daughter of a king in the Magical World meets a two horned person on her way home.

Bat Megmel is a girl that lives in the Magical World. One day, while practicing magic, she accidentally unleashes the demon king Atler. She must seal him again.