The 50th Black Swan; the first Black Swan to be able to completely neutralize Strauss' power. She wants to protect her grandfather by controlling the vampire king, but is often unsettled by Strauss' enigmatic nature. Her face bears an uncanny resemblance to Yuki's (the 49th Black Swan), although their personalities are quite different. Like her grandfather, Kayuki was first introduced wearing a mask because she was ‘shy’.