In the other world of Ente Isula, the demon king and the hero are enemies. In modern Tokyo, Maou Sadao and Yusa Emi are still working hard. Together with everyone in the Demon King's Castle and the high school girl Chiho, they are familiar with Japanese life and spend every day in the economic boom. One day, a mysterious girl appears and chaos occurs in the Demon King's Castle. She is a visitor from Ente Isula. In order to raise this child, you can't support the family expenses without working... A six-tatami Demon King's Castle, a freelance demon king's civilian fantasy, the ups and downs of the TV animation Act 2, begins! !