Vampire hunters

In a world where normal people can’t see the demonic creatures that hunt and kill them, those who are tasked and burdened with the task of hunting these creatures are non other than ones called vampire hunters. On a night like any other a boy suddenly gets caught up in the mess and loses his sister, and he seems to posses some mysterious power, what shall be the fate of this boy, read to follow the life of this once innocent boy who questions his beliefs and ideals as he goes on his journey