After humanity's devastating defeat in the Abyss, a realm where humans were forced to compete against monsters and other races by a capricious god, the last survivors execute a desperate plan. They send their strongest warrior back in time, carrying the knowledge of humanity's future downfall. As the chosen reincarnator, he must use his future knowledge and combat experience to change humanity's fate, navigating through increasingly dangerous levels of the Abyss while preparing mankind for the battles to come.
