Ryuki Shi is the reigning emperor of Saiunkoku. He is nineteen years old when the story begins. The youngest of six brothers, he was an unlikely candidate to ascend to the throne. Of his five elder brothers, four killed each other over the succession and one was exiled for treason. Ryuki secretly hoped that Seien, his beloved older brother, would eventually return from exile and take his place as Emperor. Ryuki's avoidance of responsibility comes to an end when he meet Shurei, who tells him of her dreams to make a better life for the nation's people. Ryuki decides to take on his responsibilities and become a respectable Emperor.