Estellia, an empire where the caste system is absolute. The status determined at birth is so rigid that it is said it will never change unless a revolution occurs. Clothing, education, occupation, social advancement, and even freedom are all dictated by one's rank.

The current Emperor is Kairos Argentro, a man who enforces the most severe class discrimination in history and harbors an extreme sense of superiority for the imperial bloodline. During the ten years of his reign, the lives of the common people have grown increasingly destitute, yet the elders who have lived under this system for generations merely regard it as the will of the stars.

The one who began to shake this empire was Lucian Berg, a knight from a low-ranking noble family. His vow to remain loyal to the country as a knight was broken just two days into his service. Differential treatment, and pay that was inversely proportional to effort. Voices of discontent were already rampant among the youth.

The Shield Fellowship—on the surface, it was just a small social club for knights. After training, they would go to the stables or a lakeside to eat dried fish. However, the stories exchanged there were far from trivial.

The sparks of revolution spread from a place closer than expected. The Imperial Knights, a gathering of the youth. In that place, plans to risk their lives to straighten the crooked empire were shared.

Those sparks spread further and further, reaching knights in other territories. Most of the knights were young and shared the same vision. The nobles were arrogant. They believed that under the constraints of status, their knights would always remain loyal just to stay alive.

Revolution is like a massive wave. No matter how well one has learned to swim, they are helpless before that tide.