Member of the Black Moon
Satsuki Yukino (Japanese)
Koan is the youngest of the Ayakashi Sisters who accompanied Rubeus to 21st Century Tokyo in order to look for Chibiusa and the Silver Crystal. This is the second animated depiction of the original manga character.
Koan has long blue hair, which she wears down except for two knots and she wears a large jewel as a head piece. Her outfit is a tight purple dress with dark vertical stripes with a blue tutu and blue heeled shoes to match. She has the symbol of the Black Moon clan on her forehead.
Koan appears in Act 15, where Rubeus gives her Code 001: Operation Recruit to convert humans to their cause. She poses as a student at T*A Girls Academy, where Rei Hino attends and becomes the leader of the supernatural club, the Black Moon. Koan sets up a fortune telling booth and tells her clients about how they will die. Koan then reveals her true self and traps Sailor Mars in a flame barrier. She is killed by Sailor Moon, but Sailor Mars, is still trapped in Koan's fiery shield, after Rubeus takes her.