An anti-Japanese young gangster assassinated the emperor, traveled to parallel China in 1937, and bound to the "Fourth Natural Disaster" system could actually summon future players to the anti-Japanese battlefield! Players think this is a 100% real immersive game. They are not afraid of death, exchange their merits for skills and weapons, and become the "Overseas Chinese National Salvation Army" to sweep the enemy. But when they discover that the blood and sacrifices in this world are not virtual, the weight of history and the survival of the nation have become everyone's mission - this "game" must be won!