High School DxD is a Japanese anime series based on the light novel of the same name written by Ichiei Ishibumi and illustrated by Miyama-Zero. The story follows Issei Hyoudou, a high school student who is reincarnated as a devil and becomes a servant of Rias Gremory, a top-class devil. The series is known for its mix of action, comedy, and supernatural elements, along with its ecchi content.