There was a nation with hundred or more years of history. Its name is "Rakususu kingdom".
It has rejected the invasion the monsters again and again by the rich and severe naturally covered with earth.
In the background there were three of the Knights.
Protect the Rakususu Castle the first Knights of the iron-clad.
The second Knights was to impregnable the Lagana fort that is located to the east of Rakususu.
Third Knights to carry out guerrilla was the sword of Rakususu excellent in attack.
Among the many times of the demon invasion, it was finally obtained the information of Oboshiki location as the home of the demon.
Rakususu king was directed to Kano-land a third Knights for annihilation.