At a Tokyo fast-food restaurant called MgRonald's, Sadao Maou works to cover his living expenses. Behind his human identity is Satan, a demon lord whose ambitions now have to compete with part-time shifts, household chores and rent.
Satan arrived in the human world with his loyal general Alsiel after the hero Emilia thwarted his invasion of Ente Isla. Their escape through a dimensional portal left them stranded in modern-day Tokyo, powerless without magic. He still intends to return and finish his conquest, but first they need a way back. Meanwhile, his restaurant job gives him another ambition: rising through the corporate ranks and ultimately ruling Earth. For now, the would-be conqueror must earn a living.
