The Legend of the Primordial Spirit

The creatures everyone calls "monsters" turned out to be Earth's original inhabitants. The ancient supercivilization ruins buried underground turned out to be the wreckage of enormous starships once used by humanity's creators to travel across the universe. And the existence of humanity... is merely a swarm of spirit-devouring insects placed on a powerful spirit-energy Earth by some godlike civilization in the universe...

In 2070, a fifty-year-old boy sets out on a strange journey to another world.