After being confronted by the archangel Gabriel, Earth-dwelling hero Emilia Justina, known as Emi Yusa, begins to question her mission to defeat the Demon Lord Satan, now living as Sadao Maou, a humble MgRonald's employee. Meanwhile, Chiho Sasaki, Sadao's high school coworker, strives for a new goal to protect herself and her friends. Engaging in secret training with Emi and Suzuno Kamazuki to unlock telepathic abilities, Chiho's efforts are disrupted when demons kidnap her. With angelic and demonic threats escalating, Sadao and Emi must reconcile their turbulent history to secure a chance at rediscovering their paths in this uncertain world.