In a world where the 7 Kings of Hell reigns, a little girl finds herself in a predicament when she suddenly bears a strange mark on her back. With her brother's intelligence, she quickly realized the mark was a symbol of ownership created by the 7 Kings of Hell. Humanity despises the people who bear the mark. The mark bearers are considered closer to a monster than a human. In the horrifying world where all of humanity hated her, she strived to survive and live as a normal human. All the while trying to create an idealistic world where the mark bearers are treated as humans.