Kasuga Arata is a Demon Lord candidate who possesses the "Demon Lord Element," which is said to destroy the world. He, along with Asami Lilith, is investigating a certain ruin. Suddenly, a dazzling light pours down from the sky. A mysterious man in a hood who looks just like Arata appears. The man has regained his power as the Demon Lord and now plans to destroy the world. He…