The Hero dreams of a woman named Yuriko who promises to become his partner, and of two young men who will become known as the Law Hero and the Chaos Hero. When he wakes, he receives an email with a demon-summoning program attached. A scientist has opened a portal to the Expanse, and demons have entered Tokyo. US Ambassador Thorman wants to intervene militarily; Japan's Self-Defense Forces under General Gotou view the demons as ancient spirits of the land and resist the Americans; a third faction led by a young woman called the Heroine seeks to prevent any armed conflict. Gotou's forces capture her; the Hero, Law Hero, and Chaos Hero free her in secret. The conflict escalates regardless: Thorman launches missiles at Tokyo. The Heroine is killed but uses magic to teleport the others to safety — a sacrifice that sends the surviving trio into a far more dangerous situation than the one they escaped.