Thread:Thunder the Coyote/@comment-5758863-20161025232129/@comment-24183810-20161027201156

...Hideki Katou is the main villain. He is the final boss Maou who wants to open the gate, claim the power and unleash hell. The whole "seeking the power beyond the gate to resurrect my family" thing was a lie, especially since it turns out in Hideki's ending that he KILLED them in exhcange for the dark power that turns him into Maou.