Before humans claimed their place in history, the skybound paradise of Hinoaruchi was ruled by demi-beings--creatures that appeared half human, half beast. The realm flourishes under the tenuous peace maintained by the demi-dragons of Ryujinkyo, until prophecy predicts the dawn of a new era shrouded in uncertainty. With the fate of the world hanging in the balance, will the birth of Kamuna, the first human child, bring disaster or salvation?

In the utopian nation of Ryujinkyo, Kamuna--a boy born with the form of a human and the left hand of a dragon--grapples with his identity in a society that both questions and fears his existence. As he begins his training in the ancient art of ryuken, his determination to prove himself fuels a growing rivalry with the fierce demi-dragon Gindu. Meanwhile, tensions simmer beneath the surface as factions outside Ryujinkyo grow restless, seeking to control the divine pulse that sustains the land...