Du Xiao died during an anti-narcotics mission. When he regained consciousness, he found himself in the mountains and forests on the outskirts of Nanjing in 1937. He encountered a Japanese reconnaissance team. He relied on the instinct of the special forces to fight back, activated the "Arsenal System", obtained initial points and novice weapons, and found himself in the story of his efforts to prevent the tragedy in Nanjing in 1937 before the city was broken.
