Honoka and her younger brother Jo, who lost their parents in an air raid, live in an evacuation site. One day, the younger brother is drafted into the army, but he escapes and runs away to his older sister. Taking advantage of Honoka's weakness and asking her to hide her younger brother, the uncle rapes her and makes her his own woman. The soldier hears rumors of his older sister being raped and forces his younger brother and sister to commit incest.