At the beginning of the world and the beginning of chaos, hundreds of races coexisted. Every time endless years passed, a strange beast would appear... Named Swallowing the Sky, which would lead to chaos in the world, the collapse of order, and the end of the era. Millions of years later, a young man was born with a celestial body in his arms. He was followed by a black dog. Wherever he went, there were mountains of corpses and seas of blood... And everyone was devastated. The young man's murderous aura penetrated the sky: "The sky will open today! I wonder if there is an immortal!"