This is the story of when the Maou the MgRonald employee was still Maou the
Demon Lord! Right as Alciel brings more allies into the fold of the newly formed
Demon Lord army, Lucifer rises up in revolt! Fed up with the way he's been
treated, the the upstart rebel obliterates Maou's fortress and flies off,
starting a wild goose chase that leads Maou and his comrades to the treacherous
south!