According to legend in the Middle Ages, knights in seven-colored armor guarded the top leaders of the royal family throughout the ages. They were invincible and invincible, and could kill any demon or evil in the world. They were the most powerful knights from seven different families who coexisted in wisdom and beauty. Among them, with the golden knight Duke Morpheus as the center, they included the red knight Arandu, the blue knight Orina, the white knight Maioba, the green knight Antonio, the purple knight Barbier, and the green knight Nicholas. The knights of each color represent a unique skill and a weapon. Only the golden knight at the head has extraordinary abilities.