Makaigaeri no Rettou Nouryokusha

Hiroto Domori is a seemingly weakling Irregular who doesn’t have any magical or spiritual powers. But what most people don’t know is that he just got back from the demon world and is the world's strongest demon killer. This "weak" demon killer goes up against an unrivaled enemy who attacks innocent people. The battle between lessers and the strongest! (Source: Manga UP!)

*Originally published by Red Rising Books on May 23, 2007 before getting discontinued. As of 2019, the web novel was picked up and published by HJ Bunko.*