In 1945, after WWII had ended, many Japanese soldiers had been interned at the P.O.W. camp on "G" island.

Lieutenant Tsubaki, a Japanese prisoner-of-war, steals into the infirmary of the U.S. Army, seeking medicine for one of his men, Corporal Mikami, who is suffering from malaria. Lt. Tsubaki is caught and brought before Major Howard, in command of the camp.

Maj. Howard forces Lt. Tsubaki to become his plaything, in exchange for the medicine, and Lt. Tsubaki has no choice but to succumb to his cruel games.

Lt. Tsubaki is increasingly humiliated in diverse ways by Maj. Howard...

When, at last, Lt. Tsubaki manages to save the life of Cpl. Mikami, with the quinine he earns in this degrading fashion, he abruptly breaks off his demeaning servitude to Maj. Howard, only to be attacked and raped by Sergeant Scott and two of his fellow soldiers, who had discovered what the Lieutenant had been doing for the Major.

Worse still, a Japanese enlisted man, Private Sonezaki, also interned at the camp, has his enormous respect for Lt. Tsubaki shattered when he, too, discovers his superior officer's shameful secret.

Together with other low-ranking Japanese prisoners, they decide to punish the superior officer for what they perceive as his treacherous weakness, by abusing him, sexually.