The 49th Black Swan; the first to be as powerful as Strauss. Renka knew her even before she became the Black Swan and while he cared deeply for her, she regarded him as a hapless younger brother. Her death serves as the catalyst for Renka's revenge oath and deteriorating mental condition. Even though she is underage, Yuki appears to have grown addicted to smoking cigarettes. After her death, Renka started carrying her favorite lighter even though it has long since run out of fluid. Despite her bleak future and suffering, she remained cheerful and optimistic; had his child lived, Strauss believes that she would have grown to become like Yuki. Because of Kayuki's strong resemblance to Yuki, Renka initially finds her presence unsettling.
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