Shi Ryūki (紫 劉輝?) is the reigning emperor of Saiunkoku, Ryūki Shi is nineteen years old when the story begins. As the youngest of the previous Emperor's six sons, each from a different mother, he had been an unlikely candidate to ascend to the throne. In childhood, Ryūki was badly treated by his mother and most of his half-brothers, who would beat him and lock him in a storage house for days in a row . Seien was the only member of the family who showed kindness to him. Ryūki often took refuge in the garden or the imperial archives; in the latter location, he first encountered Shōka Hong, who tutored the young prince and encouraged War General Sou-Taifu to teach him swordsmanship.
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