Towers of Heaven: Book 1

In a world where six massive, invulnerable towers have suddenly appeared, they serve as gateways to dangerous, monster-filled realms offering treasure and power. The towers pose a deadly threat, with waves of monsters attacking Earth, leaving only a handful of survivors by 2083. In a daring final attempt to defeat the towers, a group sacrifices their lives to clear the last floor, and one survivor is granted a wish—leading him to go back in time to prevent humanity's destruction.