After being suddenly thrown into the abyss, Ludis ended up dying. And ended up reincarnating in his favorite story, Tower of God! He vowed to bring a new era to the Tower. An Age of Chaos! ... In the Tower there is a legend. If you meet someone with dark hair that seems to absorb the light, and wearing a blouse that says "The Chaos" you'd better run right away, and never look that person in the eye. Because if you look into his eyes, you can see a real hell of demons! This dark-haired person will receive several nicknames, but the most famous and accepted is The Calamity!