Demon-destroying Sky Knight!

7000 years have passed, the sky knight studied the powers of light taught by his teacher, the god of light tower.
He succeeded in destroying the buffalo demon, and the demon's ancestor was restrained by the power of his soul using the soul-sealing sky sword.
The buffalo demons do not accept their ancestors being destroyed by humans, they plan to invade the earth again after 3000 years of peace.
The sky knight named Auros Revila was the sky knight who succeeded in destroying the power of the buffalo demon and sealing the soul of the slayer demon.
Auros Revila is a knight sent down by the great heavenly prosecutor to protect human earth and was given a long life of up to trillions of years. Auros Revila also wants to find a replacement in the world to help him attack the demons who could come to destroy humanity at any time.