On the verge of destruction, earth already crumbled in pieces and only a small part of mankind survived. The surviving humans formed special squads and wore special armor to protect themselves from the invasion of demons to no avail, and one by one they perished. Suddenly a man fell from the sky, his clothes tattered and his body wounded. One of the surviving soldier, a beautiful lady called Karina, immediately rushed to the man’s side and opened his helmet. That man is called Nira.