Youhiki is the Japanese name for Yang Guifei, the legendary beauty of the Chinese Tang dynasty, who lived from 719 - 756.

Her story was highly popular in Japan, where rumor states that she escaped from her death during the An Lushan Rebellion, crossed the sea to Japan, and lived out the rest of her life there.

In Mirage of Blaze: she becomes guardian of the Japanese seas as a sea goddess. Lady Tomo, who worshiped her in life and became one of her handmaidens after death, adopts her name during her quest to retrieve the tide jewels 'manju' and 'kanju.'