Introduction: A new life. A new world. A destined path. Someone once asked, what's a demon? Leo replied, "They are the incarnation of evil." Then what about Humans, Pirates, Hollows...? Are they demons as well? Through his life Leo found his answer. In every world there will always be evil. I won't look away when evil reigns supreme in front me. Why? Because, I! AM! A! DEMON! SLAYER!...