[DeepL Translation - needs review] Introduction to Volume 1: In the latter half of the 20th century, a mysterious creature called "Iperit" suddenly appeared on Earth. Recognized as the enemy, most of the human race has been destroyed and the earth has been reduced to ruins. Deluha, a survivor, chooses to die in despair, but is spared by a man from a certain research institute. At the institute, there were girls who were created to fight against Ipperit!
(Translator: DeepL)
