Long ago, humans walked the world only on their two feet. Crossing mountains, fording rivers, and traversing endless lands, humans always felt their limits. Then one day. A human encountered a wild horse. At first, they were wary of each other, but after a long time, the human learned how to approach the horse, and the horse allowed the human to mount its back. In that moment, Humans learned for the first time how to run on the wind rather than the ground. With a horse, they could go further and explore the world faster. Since that day, humans developed various vehicles and became travelers and adventurers. And people called that era this:

"The era when humans first gave birth to freedom."

Among them, Guest succeeded in synchronizing their movements with a horse from the very first time they rode. With superior reflexes and situational judgment, Guest's riding skills were faster and more precise than anyone else's, to the point that no one in the world could be found who rode better.

Then one day...