Three years after the end of the world, mankind is on the verge of extinction under the iron heel of all races. As the last guardian, Shen Ye sacrificed himself in the decisive battle with the "Guixu" gate, but accidentally reborn with the "Apocalypse Guardian System" and returned to three months before the disaster broke out.
At that time, the shadow of "Return to Ruins" had not yet enveloped the world, but the vanguard of all races had quietly penetrated, and the "Key to Return to Ruins" that could prevent the disaster were scattered in the sketchbook left by a girl named Su Xiao and her mother. In order to rewrite the fate of mankind's destruction, Shen Ye embarked on the road of protection and search for secrets: from fighting off bullies on rainy nights on campus, to competing with the mysterious organization "Black Crow"; from seizing key fragments from the Longkushan ancient tomb, to sealing the alternate passage for all races across China.
Relying on the fighting instincts he had developed in the last days and the abilities granted by the system, he killed the vanguards of the Shadow Scales, the Diggers, the Rotten Poisons, and other tribes along the way. He also awakened the power of the key host in Su Xiao's body during the battle. The two worked hand in hand to gradually uncover the thousand-year secret of the "Guixu" invasion.
When the twelve backup passages were sealed one by one, generals from all races came out, and the main gate of "Return to Ruins" was about to open, Shen Ye was no longer alone - he gathered the awakened humans, integrated global resources, and led the human race to launch a desperate counterattack with the "Guide to Ruins Key" as a guide and China as the foundation. From guarding one person and one city to leading the entire race, Shen Ye will eventually break the shackles of the rule of all races and let the flag of the Chinese race be planted on the glory of the top of all races!
