Seven girls (all named Oshare, Sweet, Mac, Galli, Kung Fu, Melody, and Fanta) are all invited to visit Kurogami's mansion in the countryside by their teacher named Mr. Togo. In that house there lives an old woman who lost her younger brother Lieutenant Gosuke Kurogami in the war, and kills girls who are blood relatives of the seven men involved in her brother's death. However, the death of Lieutenant Kurogami is no one's fault, and it ends as a tragedy (against resentment) that was the result of glorifying his death by an old woman who was his only relative .—Anonymous