After the nuclear war, the world became a radiation wilderness, and the remaining giant cities were strictly stratified: everyone in the outer city at the bottom was implanted with a chip and survived with a "social value" score. Those who scored less than 60 would be exiled to the wilderness to mine.
Ajin, a left-behind child, was forced to enter this cold city because of the death of his grandmother, but he glimpsed the weirdness and cruelty of the world when he first entered. Rating system, class barriers, mecha shadows, black market transactions... He struggled to survive step by step from the bottom of being discriminated and oppressed.
He is self-taught, deciphers secrets, encounters rebels, learns how to control mechas, and completely transforms after his family suffers a disaster and lives in the wilderness. He dealt with the totalitarian government and the ambitious rebels, stirred up the world as a double agent, and finally awakened the legendary first-generation mother mecha, leading the people at the bottom to break the shackles, overthrow the dictatorship of Tianqing City, and return true fairness and freedom to the world.
