Japanese: コーアン
Romanji: Kooan
Aliases: Koan Kurozuki
Residency: Nemesis, Tokyo, Japan

Member of the Spectre Sisters


Petz, Calaveras, Berthier (sisters)




Black Moon Clan

Gender: Female
Species: Nemesis Humanoid
First Appearance
Manga: Act 15 Infiltration - Sailor Mars -

Koan is the youngest of the Spectre Sisters who accompanied Rubeus to 20th Century Tokyo in order to look for Chibiusa and the Silver Crystal.

Nomenclature & Etymology


Koan is named after Kooankou (紅安鉱), a mineral that is also known as Kermesite and Red Antimony. The "Kermes" part of Kermesite means "Crimson." The Kanji character that is missing is the character for a "mineral" or "ore." Kermesite is found in chocolate as well as other places.

Her given human name in the Japanese manga is Koan Kurozuki, with her last name meaning "black moon".

Her Tokoyopop name Catzi/Catzy could be because she has a hairstyle that resembles cat ears. Her old dub name Catzy which could also sound like Cat could be in contrast to Berthier's DiC name Birdy/Birdie, which both names indicate "cat" and "birdy".


Koan has wavy dark purple hair that falls down her back and dark purple eyes. She wears a pink pinstriped onesie, a dark purple tutu, and dark purple heels. She also wears a black rose corsage around her neck and an identical ring on her right hand.


Koan first appeared in Act 15 of the manga, where she was in charge of Operation 001: Operation Recruit. Disguising herself as a T*A Academy for Girls student named Koan Kurozuki, she recruited people to the Black Moon by foreseeing their deaths and then promising a peaceful passing if they joined her. Unfortunately, those who agreed bore a crescent sign that would then spontaneously combust, as they were most likely unable to handle the power.

After finding one of the school's teachers who had suffered this fate, Sailor Mars confronted her but was trapped in Koan's flame barrier. Though Sailor Moon used her new Cutie Moon Rod to destroy Koan with Moon Princess Halation, she was unable to break the flame barrier, and Sailor Mars was abducted by Rubeus.


Koan in the fight uses the Dark Fire to create streams of fire, flaming barriers and set fire to people and objects such as Sailor Moon's tiara. She can also use her fire to trap her opponent in a sphere of flame.




  • Koan is the Spectre Sister counterpart of Sailor Mars, as both use fire-based attacks.
  • In the Materials Collection, her ideal voice was described as a sexy adult-sounding voice.
  • In the German translation of the manga, both Calaveras and Koan stated to be the youngest sister.
  • Koan appeared in chapter four of the video game Sailor Moon: Another Story, and she been turned evil again, along with her sisters. She was the first to attack the Senshi on the Black Moon UFO. However, instead of being healed, she was killed by the Sailor Senshi. She used the attack Dark Fire.
  • Koan is forcibly changed back to her evil self by Apsu and is a boss fight in Sailor Moon RPG Another Story. However, she like her sisters seems to still have control of their minds, but their bodies are forced to fight the Sailor Senshi. Also, the Sailor Senshi are forced to kill them. It is unknown if they were revived afterward.
  • She is named after the mineral Kermesite, known in Japanese as "koanko." Among other places, kermesite is found in chocolate.

Black Moon Clan
Nega Moon Symbol

Leaders WisemanPrince Demande
Spectre Sisters KoanBerthierPetzCalaveras
Droids Aquatici and Veneti
Other Members RubeusEsmeraudeSaphirBoule BrothersBlack Lady

Leaders WisemanPrince Demande
Spectre Sisters KoanBerthierPetzCalaveras
Droids AtsugesshoNipasDumbullFuraikiJamanenAvocadoraAkumuudaJakokuMaxipanUderingPharmakonDogbarGiwaakuLuax
Other Members RubeusEsmeraudeBlack LadySaphirBoule Brothers

Leaders WisemanPrince Demande
Spectre Sisters KoanBerthierCalaverasPetz
Droids Aquatici and VenetiHyuru Hyuru
Other Members RubeusEsmeraudeBlack LadySaphirSpotted TilmunAaronManna

Leaders WisemanPrince Demande
Spectre Sisters KoanBerthierPetzCalaveras
Droids Aquatici and Veneti
Other Members RubeusEsmeraudeSaphirBoule BrothersBlack Lady

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