As the world moves on from the war and technological advances bring changes to her life, Violet still hopes to see her lost commanding officer again.

In a post-war alternative timeline, Japan is divided into the North, controlled by the Union, and the South, controlled by the United States. A mysterious high tower rises within the borders of the Union. Three high school students promise to cross the border with a self-built airplane and unravel the secret of the tower.

People everywhere were enjoying a new game called Ordinal Scale, an ARMMORPG developed exclusively for the Augma, a new wearable console designed for AR (augmented reality) gaming. But, the players had no idea that a nightmare from the virtual world was starting to spread into reality! As his fellow players find themselves in danger, the hero is called upon once again.