In 2005, archaeologists unearth letters buried in the volcanic ash of Iwo Jima, shifting the perspective to the harrowing defense of the island in 1945. Newly arrived Lieutenant Colonel Baron Tadamichi Kuribayashi takes command of the doomed garrison. An educated man who spent time in America, Kuribayashi knows traditional Japanese Banzai charges are suicidal. Against the vehement objections of his traditionalist subordinates, he orders his men to abandon the beaches and carve an intricate network of tunnels, caves, and pillboxes deep into the island's rock, prioritizing strategic survival over glorious death.Among the defenders is Private First Class Saigo, a former village baker desperate to survive the war to see his newborn child. Saigo endures brutal physical labor, starvation, and the constant, sadistic beatings of Lieutenant Shimizu, a fanatical Kempeitai military police officer exiled to the front lines for failing to prove his ideological purity. Despite their initial hostility, Saigo and Shimizu bond through shared misery and the terrifying reality of their situation.As the colossal American invasion fleet arrives, Kuribayashi’s underground defense strategy stuns the US Marines, inflicting devastating casualties. However, the American forces slowly gain ground, using flamethrowers and explosives to systematically clear the caves. Despair permeates the garrison as food and water run out, and wounded soldiers are given grenades to commit suicide rather than surrender.Shimizu, whose blind faith in the Imperial military shatters after witnessing the cruel execution of a captured American boy and the heartless treatment of his own wounded comrades, decides to desert. He forces Saigo to flee with him under the cover of night. However, they are quickly cornered. While Saigo manages to hide, Shimizu surrenders to the Americans. Shortly after, Saigo discovers Shimizu’s dead body, shot while
trying to escape captivity, a tragedy that deeply scars him.Back at the dwindling Japanese headquarters, Kuribayashi’s forces are decimated. In a final, desperate act of defiance, Kuribayashi leads a broken fragment of his men in a night counterattack. Mortally wounded in the ensuing chaos, he orders his loyal aide, Lieutenant Nishi, to end his life. Nishi complies before committing suicide himself.The following morning, a delirious Saigo, desperate to avoid capture, attempts to bury Kuribayashi’s body in a secret grave. An American patrol discovers him, and in a frenzied panic, Saigo attacks them with a shovel before being beaten unconscious. He wakes up on a stretcher, surrounded by weary
American soldiers, having survived the carnage that claimed almost every soul on the island, leaving his buried letters as the only testament to the tragedy.