During his childhood, Gabriel had suffered a trauma from a demon invasion on his village. 7 years later due to his past tragedy, he is now a world renown demon hunter known as "The Demon Executioner". But there is something in Gabe's past that he doesn't know about and that's the fact that deep inside of him, there is something inside that he despises more than anything and he's one of them. How will Gabe continue his life knowing that he's a half demon?