Justus is a cambion who doesn't nessacarily care whether he is considered a demon or not. Despite strict regulations in the kingdom Lleuca and most other kingdoms, he lives peacefully in harmony as his alter-ego, Levi. Even after being considered a demon, Justus was born with unusual deer-like horns. He seized that opportunity to fake Levi as a beastkin of a deer. Eventually, sadly for Justus, the royal guards of Lleuca eventually did find out about his origins and forced a contract onto him. As is, he still was ordered to hide his demonic origins, even to the king himself or the contractors would be punished severely. From that point on, he became a guard dedicated to protecting the castle.