After handing in a report on the treatment of Chinese colonial labor, Kaji is offered the post of labour chief at a large mining operation in Manchuria, which also grants him exemption from military service. He accepts and moves with his newlywed wife Michiko, but when he tries to put his ideas of more humane treatment into practice, he finds himself at odds with scheming officials, cruel foremen, and the military police.

'The Human Condition I: No Greater Love' delivers a powerful anti-war statement with masterful direction and thought-provoking exploration of morality during wartime. Tatsuya Nakadai's performance anchors this harrowing examination of conscience versus oppressive systems, praised for its brave confrontation of Japanese military brutality. However, some find the film mentally depleting and struggle with its demanding nature. Mixed opinions emerge regarding historical authenticity and whether the protagonist seems too idealistic, though most consider it a captivating, emotionally devastating epic.