The plot revolves around the Dark Lord Leonis Death Magnus, who has been in a magical coma for thousands of years. However, it is time for him to awaken from his slumber. Upon regaining consciousness, the main character, to his great surprise, realizes that he is in the body of a young boy. Before Leonis can understand what has happened to him, he encounters Riselia Ray Crystalia, who is currently engaged in a constant battle against the voids - creatures that have nearly wiped out humanity from the face of the Earth.