The Demon War

Overview

The Demon War was the five-year conflict that followed the appearance of the Gate in the Eterna Mountains. The opening of a permanent route between the human and demon realms turned a territorial crisis into a continental war. Humanity's six kingdoms, long divided by their own rivalries, formed an alliance against demonkind, while the demons fought under Magnus, the ancient king who had ruled them for centuries.

The war ended through the work of three figures later remembered as its heroes: Shun Sato, Reiko Hayami, and Kimiko Torafuku. Their alliance crossed the division between human and demon and made the negotiated peace possible.

Shun's service and defection

Shun entered the war as a fifteen-year-old demon soldier. His earliest battlefield memories are of marching through the forests of Eterna beside armored demonfolk and of finding companionship among warriors who accepted him despite the prejudice attached to his mixed blood. One of those comrades, an older horned demon with wild blond hair streaked with grey, became the first friend Shun remembered having.

That friendship ended under human war magic. Shun found the demon's body burned almost beyond recognition and answered the loss with violence, killing a human survivor who begged him for mercy. The experience remained embedded in his understanding of war: peace was not an abstract ideal to him, but an alternative to a cycle in which every victory created another grave.

Shun eventually became one of Magnus's Royal Knights. He nevertheless broke with his king and fought beside Reiko and Kimiko to end the war. That decision was the first great defiance of Magnus's authority and established the divided loyalties that shaped Shun's later life. He chose peace with humanity, but the demon court never ceased treating him as a subject whose obedience could be demanded.

The three heroes

Reiko, Kimiko, and Shun survived the conflict as comrades whose temperaments and abilities differed sharply. Their cooperation demonstrated that neither side could end the war through force alone. The public history remembers them as the two human heroes and the demon who joined them; the private history also records the friendships, arguments, and losses that bound them together.

Shun's relationship with Akiyama Magnus, commander of the demon Royal Knights, was also forged in this period. Shun regarded Akiyama as a battle brother but never forgave him for being absent when their older comrade died. Akiyama, in turn, remembered the broken unit as the first family he had chosen for himself and carried guilt for failing to preserve it.

Settlement and legacy

The war concluded with the Peace Treaty of Hope. The treaty turned the Eterna range into demon territory on the human side of the Gate and created the Tower as a neutral institution responsible for controlling passage. Shun's reward for helping to make peace was appointment as its guardian, a position he later described as a cage.

The war remained the central reference point for every later crisis. The neutrality imposed on the Lord of the Tower was intended to prevent a single intervention from reigniting it. Magnus continued to regard Shun as a disobedient retainer, while Shun measured every political decision against the possibility of returning both realms to the bloodshed he had witnessed as a child.