- At this rate, one day war will break out again.

- It can’t be... after all, peacetime has just arrived...

Underworld has finally united after three hundred years of war. People of the Human World and the Dark Territory, goblins, orcs, ogres, giants... All races entered into an agreement on eternal peace. For the first time in history, cultural exchange began between the Human World and the Dark Territory. The Human World got rid of the four imperial families and high-ranking nobles, the dark legacy of the High Priestess Administrator. Now it is ruled fairly by the Integrity Knights. In the Dark Territory, the right of the strong - the absolute power of the strongest - is abolished. Races that were on the verge of extinction are beginning to be reborn. It is unknown where the “lost child of Vector” came from, defeated the god of darkness and brought peace to this universe.

But in the very heart of the Human World, in the white tower of the central cathedral... The main decision-maker of the Human World, the supreme knight Kirito says in a whisper shocking words from Ronye Arbel, who became a student of the Integrity Knights for her services in the battle.

- At this rate, one day the war will break out again.