Gaia is a massive planet where swords and magic, spirits and dragons, gods and demons coexist. The central stage of the story is the most prosperous continent, Ismaran, where numerous nations and races repeat cycles of coexistence and war. Dead souls are reborn through the Gate of Reincarnation, and rarely, reincarnators who retain memories of their past lives appear. Under the influence of a sealed evil god, dimensional rifts and monsters are increasing, and the world is facing a new upheaval.