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Koan (Sera Myu)
Member of the Ayakashi Sisters
Berthier, Calaveras, and Petz (sisters)
Koan's appearance bears the one on the anime, and also manga. She has purple hair, which is up until her shoulders, and has a dark crescent. Koan shares the same dress with the one on the anime, and manga, as the same colored pink top and pants, which had black lines going from top to bottom, and the whole top, and pants were divided by a black skirt. She also had a purple-like jewel on her head, and the same shoes.
Koan was played by Seiko Takuma in the musical Tanjou! Ankoku no Princess Black Lady and by Hinami Someya in its revision.