Within the country, there exist the threat of Illegal Magicians that abuse Magic for crimes. They were tempted by the evil Divas, who have evil intentions, and formed a Illegal Contract, allowing that power to rampage uncontrollably. At the same time, the Knights are also a police organization. They are forced to manage these Illegal Magic Users.”The Divas that harbor evil intentions towards human would contaminate the human’s spirit as the reward for their power.Because these things were extremely risky, within Japan, all Diva contracts outside of the Solomon’s 72 Pillars of Demons were strictly prohibited.The past Illegal Magic Users had once made Tokyo become ruins.