Michiru Kaiou

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Character Information
Name: Michiru Kaiou
Name (kanji/kana): 海王みちる
Alignment: Moon Kingdom, Crystal Tokyo
Species: Human
Gender: Female
Lives: Tokyo
Occupation: Student, professional violinist, art teacher (anime only)
Family: Haruka Tenou (cousin; dub only)
Associates: Haruka Tenou, Setsuna Meiou, Hotaru Tomoe
Aliases: Sailor Neptune, Princess Neptune (manga and Crystal only)
First Anime Appearance: A Beautiful Boy? The Secret of Haruka Tenou
First Manga Appearance: Act 27 Mugen 1 Yokan
First PGSM Appearance: N/A
English Name: Michelle Kaioh (dub), Michiru Kaioh (Mixx manga), Michiru Kaiô (Kodansha manga), Michiru Kaiou (Viz dub)
Actors: Masako Katsuki (anime), Sayaka Ohara (Crystal), Barbara Radecki (dub), Lauren Landa (Viz dub)

Michiru Kaiou was the civilian identity of Sailor Neptune. She appeared in most versions of the Sailor Moon series.


Michiru was mature, calm, and quiet, and it was hard to tell just what she was thinking. She had a distinct sense of humor, though, and enjoyed teasing Haruka. According to the Materials Collection, she had a kindness "as great as the sea."[1] She was an athletic swimmer, a gifted artist, and an accomplished violinist; she often performed in concerts, either by herself or jointly, such as when she held a concert with the Three Lights.

She lived the life of the wealthy Tokyo elite and, in the S season/Infinity arc, attended Mugen Academy, a school for genius students. At the time, however, she attended it to infiltrate its operations.


Michiru had no known relatives in either the manga or the anime series, and seemed to only live with Haruka. In the manga, however, she moved in with Haruka and Setsuna Meiou to raise baby Hotaru after she was reborn at the end of the Infinity arc, and the four of them formed an adopted family. In the original English dub, she and Amara (Haruka) were cousins.


Michiru was romantically linked with Haruka Tenou. Although the anime was not explicit about it, there were hints given (especially during the Stars season) that Michiru and Haruka had a physical relationship. In the first English dub, however, Michelle (Michiru) and Amara were changed to "cousins" in order to avoid controversy surrounding homosexuality. Michiru and Haruka's romantic relationship remained intact in the Viz Media dub.


In the musicals, Michiru was played by Kahoru Sakamoto, Chikage Tomita, Miyuki Fuji, Hiroko Tahara, Sara Shimada, Yuuka Asami, Tomoko Inami, Takayo Ooyama, Sayaka Fujioka, and Ayana Kinoshita.


  • Michiru's skill with the violin extended to playing the instrument while simultaneously juggling a lemon.
  • Michiru and Haruka each seemed to own a helicopter and could pilot it themselves. In the manga, Michiru had her own helicopter named the Kaioumaru (海王丸; Ocean King).
  • Michiru seemed to possess some form of psychic ability that extended beyond intuition. She not only awakened as a Sailor Senshi on her own, she could apparently predict a Daimon attack, sensed Queen Nehellenia's presence, and could tell when Queen Nehellenia was using an illusion on her and Sailor Mars. Her talisman, the Deep Aqua Mirror, possibly enhanced or at least helped her with this ability.


  1. The Manga of Naoko Takeuchi - Sailor Moon - Materials Collection - Translated by Alex Glover
  2. Q & A Rocking the Boat (an interview with Megumi Ogata)

Civilian identities of Sailor Senshi
Solar System Senshi
Usagi Tsukino | Ami Mizuno | Rei Hino | Makoto Kino | Minako Aino | Chibiusa
Haruka Tenou | Michiru Kaiou | Setsuna Meiou | Hotaru Tomoe/Miss Dream | Chibi Chibi
Luna Tsukino | Shiva Shingetsu Astarte
Kinmoku Senshi
Kou Seiya | Kou Yaten | Kou Taiki | Princess Kakyuu
Shadow Galactica Senshi
Chuuko Nezu/Chuu Rat | Reiko Aya/Half Bird | Akane Karasuma/Manila Karasu | Nyanko Suzu | Miss Butterfly
Senshi in Parallel Sailor Moon
Kousagi Tsukino | Ami Jr | Rei Jr | Mako Kino | Mina Aino