A mysterious woman from the Ten no Haoh series, who joins Ken-Oh's army as a military strategist.
It's later revealed that she is the sister of Gaiya and a master of Kokuzan Ongyō Ken (黒山陰形拳, "Black Mountain Secret Form Fist"). Her military skills attract the attention of Souther, who requests that she joins his side, but she rejects his offer out of her love for Raoh. However, she is seen leaving Souther's quarters and imprisoned by Raoh in Cassandra as a traitor.
During Raoh's absence, Sakuya wins her freedom to help Reina defend Raoh's headquarters from Yuda. Raoh arrives to defeat Yuda but he is closely followed by Souther, who joins the invasion. Sakuya sacrifices herself to end the fight, claiming that until Souther accepts love or Raoh understands sadness neither of them can achieve supremacy.
