Aki Kitsutaka  

, 橘高秋希

Tourus sister, also known as Burial Doll of Kurogane, consumed all of her life force and disappeared. Her death was a significant factor in Tokiya and Touru's desire to destroy the Second World and travel to the Third World, where Akis existence could be found. The two-sword skill of Kuroganes Kaioh reminded Tokiya of Aki, causing him to wonder if she was trying to stop him from achieving his goal. In this context, Tourus sister is a skilled swordsman who graduated from Rakurowa High School. She saved Tomoharu and Kanade when they were attacked by a stray Daughter at the Kitsutaka residence. Later, Aki gave Tomoharu her necklace after he decided to return to the Second World.