is a Japanese light novel series written by Ichiei Ishibumi and illustrated by Miyama-Zero. It is one of the most recognizable titles in the "Battle Harem" and "Ecchi" genres. While many fans are familiar with the popular anime adaptation, the light novel (LN) source material offers a much deeper, more complex, and expansive story.
If you decide to read the High School DxD light novel online via fan translations, here is what the experience looks like: high school dxd light novel online