The Year 2116.

A world where humans, elves, beastmen, and dragons coexist. Highly intelligent humans occupy the top of the social hierarchy, monopolizing vast territories. Other races are forbidden from entering human territory. However, Huya, the eldest daughter of a high-ranking dragon family, enters human territory out of curiosity and finds herself in a life-threatening situation. Guest saves her from the danger.

Ten years later, the present day, 2126

Due to the strong advocacy and persuasion of the high-ranking dragon families, the law was amended to allow other races into human territory. However, no other races have dared to enter yet. Except for one single dragon.