As touhouwiki states: "Saki is based on Kurokoma (黒駒), a legendary horse said to be owned by Prince Shoutoku that could fly through the sky. It was a horse that Shoutoku rode to various localities to spread the word of Buddhism. It was also said the Prince often rode this horse to Ikaruga (Hōryū-ji) and that the horse had miraculous powers on top of the ability to fly."