Her older sister Honoka and her younger brother Jo, who lost their parents in a major air raid, were living in an evacuation site. One day, his younger brother is drafted into the military, but he escapes and runs back to his sister. Taking advantage of Honoka's weakness when she begs to hide her younger brother, her uncle forcibly rapes her and makes her his woman. The soldier who heard the rumor sees her older sister being raped and forces her excited younger brother and older sister into incest.