As Japan's war of aggression against China intensifies, beginning with the Nanjing Massacre in December 1937, Kohei, who had secretly married Junko, the second daughter of the Godai family, deploys to the front lines, witnessing the atrocities of the Japanese army firsthand. Meanwhile, Shunsuke also takes to the front lines of the battlefield, engaging in a fierce battle against the Soviet army at Nomonhan.