In the totalitarian nation of Akrodish, the Demon General instigates a global war by forcibly abducting scientists from foreign countries and forcing them to develop deadly weapons. Under despair and terror, the scientists are driven beyond human limits to create monstrous arms. Yet, hidden within this darkness, a savior emerges—Masked Investigator Night Angel, who stands against the Demon General's conspiracy to fight for justice. However, when confronted by Bio-Weapons No. 1 and No. 2, Night Angel is defeated and loses consciousness. To conceal the world's impending destruction, the Demon General forces Night Angel in front of television cameras to give false testimony. But she refuses to distort the truth. As a result, brutal torture begins. Her ordeal reveals the battle between justice and evil, and the profound depths of the human spirit.