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Kū Shiratori (白鳥 空 Shiratori Kū?), also known as "Cielo", is the Absolute Angel Bastille (バスティーユ Basutīyu?). She is a high school girl who feels as though she is drifting through existence and describes herself as "empty". She gives letters to a mysterious prince in her dreams, and talks to him in her thoughts. An introverted girl, she thinks she lacks good qualities and seems easily overwhelmed by situations which differ from her previous experiences and expectations.


Kū is a rather bland high school girl who feels as if she is drifting through her existence and she always describes herself as being "empty". She never misses a chance to give letters to the mysterious prince in her dreams and frequently talks to him in her thoughts and, sometimes, even out loud. In reality she is a shy (almost stereotypical) and self-deprecating girl, believing that she lacks good qualities. She appears to be easily overwhelmed by situations that deviate from her previous experiences and expectations.

Her original name is Cielo and she is the original Absolute Angel researched by Kazuya and his grandfather. During the incident ten years before the main story, Cielo is split into four entities: Murakumo, Batraz, Claíomh Solais and Megingjord; Megingjord is also divided in two. Kū is the original body; Valteishia is her soul, which is why Kū feels that she lacks something inside. At the end of the series, her body crumbles and she is reincarnated as a younger version of herself. Before the end of the last episode, she dreams of the four Absolute Angels. After the credits of the last episode, Kyoshiro Ayanokōji and Setsuna find her near the European Alps; when she sees Kyoshiro, she remembers her past life.


  • The name means "sky" (空).
    • Her original name is Cielo (チェーロ Chēro), meaning "sky".
  • Kū's surname Shiratori means "white" (白) (shira) and "bird" (鳥) (tori).
  • Kū's personality and characteristics resemble Himeko Kurusugawa in Kannazuki no Miko.