The Devil Is A Part-Timer! Vol. 0-II (Light Novel)

When Demon Lord Satan Jacob’s plans to conquer the world of Ente Isla are thwarted by hero Emilia Justina, he and his demon general Alciel escape through a magic gate and find themselves in modern day Tokyo! However, due to magic not existing in the world, they are powerless and forced to act and live as normal human beings. In order to survive, Jacob, now named Sadao Maou, gets a job at a fast food joint while Alciel, now named Shiro Ashiya, begins working as a housekeeper while trying to find a way to regain their magical powers. And they aren’t alone: hero Emilia has come through the gateway as well! Now named Emi Yusa, she works by day at a call center while she tries to track down Jacob and ensure he doesn’t destroy the world. But how’s a powerless, broke part-timer supposed to do that anyway?
In Vol. 0-II, the Iron Scorpions, led by Arciel, have joined the new Demon Lord's army, and their leader Lucifer has rebelled! Dissatisfied with his treatment, he destroyed the castle and ran away to the south, the sphere of influence of the Malebranche tribe. Fearing that Lucifer, the strongest Hagre Demon, would come into contact with the Malebranche, the Demon Lord and Camio, who had been planning to march south at some point, decide to march ahead of schedule! The Demon Lord's army is met by a large force led by Malacoda, the chieftain of the army, and he manipulates illusions to plunge the battlefield into chaos, forcing the Demon Lord and his men to fight an uphill battle. Furthermore, Lucifer, who has teamed up with Malacoda, appears as an enemy…? At the end of the decisive battle, the truth about the demon world and the heavenly world will be revealed!
Notice: This book is written in Japanese.