In the harsh region known as the borderlands, humans must fight an endless battle against demi-human creatures that come at them relentlessly, intent on taking their land and their gods. A young boy named Kai, fighting to defend his village, sustains a life-threatening injury that causes him to regain memories from a past life. If you’re not a guardian bearer, it’s like you’re playing life on hard mode... Kai’s newfound knowledge gives him a new sense of the unfair “rule set” that governs the world around him. One thing is clear: For those without a god to serve as their guardian, life is a constant struggle for survival. Thus begins the epic tale of a young boy’s ascent into a vast world filled with magic, bloodshed, and mystery.
 
(Source: J-Novel Club)

In order to protect the lands of humans from the Demi-human tribes of the macaques and orgs, a young boy named Kai rages onto the battlefield.
In the midst of a battle one day, Kai suddenly remembers memories of his past life.
Memories that are more advanced than the world he currenlty lives in.
Kai returns safely to the village and begins to recall his memories, awakening new powers along the way, but soon after, finds himself in a deadly battle with an org after receiving a near-fatal wound...
In a world where humans, Demi-humans, and gods mingle, a story of a young boy's battle and growth unfolds!
 
(Source: MangaPlaza)

Humans fight to protect their land from invading demi-human tribes in relentless battles. As his world is engulfed by intense warfare, Kai, a village boy from Lag, joins the fight to defend all he knows. After Kai’s comrades fall one by one and he’s injured, he suddenly recalls memories from another life. A fantasy tale unfolds as a village boy explores a world of magic, mystery, and heroism. 
 
(Source: Crunchyroll)

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