A world where magic and magic stones support the foundation of society――. People were enjoying a rich life due to the development of magic technology, but behind the scenes, crimes involving illegal magic stones and the misuse of magic had become commonplace, and order was being quietly eroded. To counter the ever-increasing magic crimes, the Illegal Sorcerer Enforcement Division, "Graus," was established. Those with determination throw themselves into the battle to protect innocent people in the gap between law and military force. This is a story of the conflict and justice of the enforcement officers who stand up to the darkness and challenge magic crimes――.