Prologue

Amidst the cluster of trees, aided by the darkness of the night, a warrior crouched in silence, waiting for her signal. She was diligent, always giving her best whenever called upon, for she had yet to be officially recognized as a spy. All her battles were merely tests to prove her worth for the position.

Suddenly, the tide of battle shifted. The enemies of her side were gaining ground, as out of nowhere, a horde of fierce, powerful warriors surrounded them. That was her signal.

Like a nocturnal bird, clad in black from head to toe, she leapt from her hiding spot into the air, where she hovered. Her sharp sword swiftly cut down the lives of her enemies with skill and speed beyond ordinary measure. As a result, her comrades sighed in relief. Their spirits lifted, and they were able to advance in the rough battle.

***

On a dojo atop a mountain, surrounded by clouds and chilled by the biting heights, a warrior was being trained by her leader, who was giving her instructions about her upcoming mission.

"Prince, where is the source of energy, and how do we protect it?" the young woman with wavy hair asked, her curiosity finally overwhelming her.

The topic felt taboo, as it was only ever mentioned briefly, and no one had deep knowledge about it. She had begun to suspect that it was merely a myth—a legend used to maintain power over all the other realms.

"If I'm being honest, we don't know for sure," he replied. "However, by protecting Sapphire, we are protecting the source of energy. And by doing so, we ensure the balance of the worlds isn't disrupted."