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The Twelve Kingdoms

Tasogare no Kishi Akatsuki no Sora
黄昏の岸 曉の天
Les 12 Royaumes : la rive du crépuscule
十二國記 黃昏之岸 曉之天

Prequel

novel
Twenty-seven years have passed since the previous king died in Kyo-kuni. Without a king, public order has broken down, and demons roam the land. Concerned about the deepening chaos in the country, a 12-year-old girl named Shujo makes a fateful decision. If the adults lack courage, then I shall be king! 

(Source: Shinchosha, translated)

Sequel

novel
A collection of short stories about a king, a kirin, and the ideals and conflicts of a people. 

(Source: Shinchosha, translated)