A character from TYPE-MOON works, first appearing in the unpublished novelization of Mahou Tsukai no Yoru and cameoing in the prologue and epilogue of Tsukihime. She was later featured in Melty Blood and the visual novel adaptation of Mahou Tsukai no Yoru. She appears as a teenager in Mahou Tsukai no Yoru and as an adult in Tsukihime. She is nicknamed "Miss Blue" due to the "Ao" in her name being the kanji for blue.
She is the magician of the Fifth Magic, allowing her to perform acts of localized time travel. During Mahou Tsukai no Yoru, she lives with Kuonji Alice and later Shizuki Soujuurou as roommates. Aozaki Touko is her older sister.
