Maou Sounanchuu!!!: Yukai na Nakama-tachi wo Soete

A demon king who lost his magical power during a battle with long angels seeks to regain it by absorbing human souls. Accompanied by four loyal heavenly kings, he arrives in the human world, only to find himself on a remote ocean island. Unable to use magic there, he and his companions begin a survival struggle, experiencing hardship and sorrow while maintaining a lighthearted attitude.