Michiru Kaiou
Japanese: 海王みちる
Romanji: Kaiou Michiru
Aliases: Sailor Neptune, Super Sailor Neptune, Princess Neptune
Residency: Tokyo, Japan
School(s): Mugen Academy

Student, Violinist, Sailor Guardian


Haruka Tenou (boyfriend)


Solar System Sailor Guardians


Moon Kingdom and Crystal Tokyo

Birthdate: March 6 (♓)
Age: 16-17
Gender: Female
Species: Human
Blood Type: O
First Appearance
Musicals: Pretty Soldier Sailor Moon S ~ Usagi – The Road to Become the Guardian of Love
Musicals Played By: Kahoru Sakamoto (1994)
Chikage Tomita (1994-1995)
Miyuki Fuji (1995-1996)
Hiroko Tahara (1996-1998)
Sara Shimada (1998-1999)
Yuuka Asami (1999-2002)
Tomoko Inami (2003-2004)
Takayo Ooyama (2004-2005)
Sayaka Fujioka (2015-2017)

Michiru Kaiou  (海王みちる, Kaiou Michiru) is the civilian identity and present-day incarnation of Sailor Neptune (セーラーネプチューン, Seeraa Nepuhuun).

Nomenclature & Etymology


Michiru's surname (海王, kaiou) translates to "Sea King", based on the Japanese name of the planet Neptune (海王星, Kaiousei "Sea King Star", the given title of Neptune, the Roman god of the sea).

Michiru's first name means "rising".



She retains her Manga and anime appearance

Sailor Guardian

Sailor Neptune's sailor uniform in the musicals was faithful to her costume in the third season of the anime. Her collar, choker, shoes, sleeves, glove fittings, and the top layer of her skirt were green, and her bows and the bottom layer of her skirt were blue. Her sleeves were decorated with dark green beads. The ornament in the center of her front bow was a sea-green cross, in the center of which was a golden circle decorated with a ring of green gems. Her choker ornament was a golden cross with a green gem in the center, and she wore golden cross earrings. The trim on her costume and the stripes on her collar were all gold.


Although Sailor Neptune did not have her own image song in the musicals, she did share duets with Sailor Uranus in "Chou Bi! Uranus to Neptune" and "Harsh! Saint Cry!!", which acted as image songs for both of them.

Sailor Guardian Info


  • Planet Power, Make Up - A musical-only transformation phrase used by Sailors' Uranus and Neptune.
  • Neptune Crisis Power
  • Sailor Crisis Power, Make Up
  • Neptune Crystal Power, Make Up
  • Sailor Crystal Power




Sailor Senshi

Solar System Senshi Sailor MoonSailor MercurySailor Mars Sailor JupiterSailor VenusSailor Chibi MoonSailor PlutoSailor UranusSailor NeptuneSailor Saturn
Sailor Starlights Seiya KouYaten KouTaiki Kou
Sailor Quartet Sailor VestaSailor PallasSailor JunoSailor Ceres
Other Senshi Chibi ChibiSailor AstarteSailor Cosmos
Civilian Identities Usagi TsukinoAmi MizunoRei HinoMakoto KinoMinako AinoChibiusa TsukinoSetsuna MeiouHaruka TenouMichiru KaiouHotaru TomoeSeiya KouYaten KouTaiki KouChibi Chibi
Allies Tuxedo MaskLunaArtemisPrincess Kakyuu

Solar System Senshi Sailor MoonSailor MercurySailor MarsSailor JupiterSailor Venus/Sailor V
Other Senshi Sailor Luna
Civilian Identities Usagi TsukinoAmi MizunoRei HinoMakoto KinoMinako AinoLuna Tsukino
Allies Tuxedo MaskLunaArtemis

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