In the distant universe lies a mysterious planet, known as RO. RO is a peaceful and beautiful planet. People of RO enjoy their happy and peaceful life. However, many have forgotten about the ancient history of RO.
RO was a planet of chaos, terror, evil, you name it. Thousand years ago evil lurked on this magnificent globe and took control of it. Hope was lost; people were in despair. Just when everyone is about to give up hope, a number of heroes emerged, fought against the evil with great magic and power. It was a battle of survival. As the heroes won battles and battles, people of RO regained their hope and pray to GMs, who were merely imaginary figures, that one day they will be free from evil again. Their prayer was answered. The heroes won the final battle and banished the evil to the core of horror, known as Nifflheim. Ancient historian named this great battle the "War of Emperium". ROian started to worship GMs more faithfully because they believe that it was the GM who helped them through the hard times. ROian prayed that the evil will be gone forever and peace will last, or so they hoped...
From this point, the saga begins!