Gu An is a crippled young man living through the Celestial Realm's darkest hour. Caught in mortal danger, he takes hold of the power of an ancient god and gains spiritual energy without limit. With that strength and an ordinary mortal sword, he cuts down wicked foes, repays old grudges and goes so far as to strike at the heavens themselves. Told as a 26-episode ONA, the story pairs action with fantasy as a disabled youth becomes a figure of overwhelming might.