The game begins with the Hero dreaming that he meets the Law Hero, the Chaos Hero, and a woman named Yuriko; she promises that she will become the Hero's partner. He wakes up, and receives an e-mail with a computer program for summoning demons attached. While out on an errand, he learns that a scientist has opened a portal to the Expanse, which allows demons to enter Tokyo. He also meets Yuriko, who says she will fulfill her promise. The next night, the Hero again dreams that he meets the Law Hero and Chaos Hero, and that they save the Heroine from a sacrificial ritual. The next day, he meets the Law Hero and Chaos Hero in reality; they reveal that they had the same dreams. News of the demons spread, and the US military, led by ambassador Thorman, decides to intervene. The Japan Self-Defense Forces, led by general Gotou, opposes them, as they see demons as the ancient spirits of the land. A third group, led by the Heroine, tries to prevent conflict between the other two. She gets captured by Gotou's forces; they are about to publicly execute her under supervision by Yuriko, but she is saved by the Hero, Law Hero, and Chaos Hero. The Hero can choose to support Thorman or Gotou, or to reject both; regardless of his choice, the conflict escalates until Thorman launches missiles towards Tokyo. The Heroine is killed, but saves the Hero, Law Hero, and Chaos Hero by using magic to teleport them to another plane of existence.