From the introduction:
The history of the world of Rokugan start for the samourais by the birth of the ninth kamis from Lady Amaterasu, the sun ; and Lord Onnotangu, the moon during an eclipse. The ninth kamis was the mysterous Togashi, the twin Shiba and Bayushi, the swift Shinjo, the beautiful Doji, the great Akodo, the strong Hida, the shadowy Fu-leng and the shining Hantei. They was the pride of their mother, but their father grow jealous. He ates them, but Lady Sun given to him a cup of sake with each child. So, when it was Hantei’s turn, she remplaced the baby by a stone with diapers and Lord Moon ate it without noticing.
Amaterasu teached her remaining son how to fight his father, to save his brothers and his sisters. And years later, Hantei goes and defied his father. They fighted, and Hantei cut his father’s tummy. His siblings felt from it to the earth throught a hole in the Sky. The last to felt with Fu-leng, because Onnotangu grabbed him with his hand. Hantei striked and cut the hand and the bone, but Fu-leng didn’t felt alone : he grabbed Hantei’s leg and they both felt on the earth.