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After losing their parents in an air raid, older sister Honoka and younger brother Jo lived in an evacuation shelter. One day, the younger brother is drafted into the army, but he escapes and runs back to his sister. Taking advantage of Honoka's weakness, her uncle rapes her by force and turns her into his woman. The soldiers, hearing the rumors, come to see the sister being raped and force her to commit incest with the excited younger brother and sister....