Protect Mamoru: Ninja Usagi's Jealousy
Mamoru o Mamore! Ninja Usagi no Yakimochi
Airing Information
Episode: EP 136, Season 4
Air Date (JP): May 27, 1995
Written by: Megumi Sugihara
Directed by: Yuji Endou
Featured Monster: Mizugeiko
North American Dub
Air Date (US): October 6, 2000
CWi Title: The Trouble with Love
Episode Guide
Connecting Hearts: Chibi-Usa and Pegasus
Forest of Illusion: A Beautiful Fairy's Invitation

"Protect Mamoru: Ninja Usagi's Jealousy" is the 9th episode of the 4th season of the Sailor Moon anime and the 136th overall. It aired in Japan on May 27, 1995. The CWi English dub title for this episode is "The Trouble with Love" and it aired in North America on October 6, 2000.


After Usagi and Rei make a mess of Mamoru's department, Rei suggests he should stay at Hikawa Shrine with her, which makes Usagi peek all day into them.


International Dub Titles

  • Brazilian Portuguese: Os Ciúmes de Serena ("Serena's Jealousy")
  • European Portuguese: O Passado da Rita! ("Rita's Past!")
  • French: L'Affaire Raya ("The Affar of Raya")
  • German: Reis Vergangenheit ("Rei's Past")


Changes from the Manga

Dub Changes

  • In the CWi English dub at the beginning of the episode, Mamoru explains to Ami that she must keep in mind the quadratic equation to solve a math problem and Ami says that she was trying to apply the Pythagorean theorem and thanks him for his help. In the anime, she makes a joke about the relativity in space.
  • The scene when Mamoru asks Diana if she would like to take a bath with him was changed in the English dub to telling her that even future kings need to relax.
  • In the anime, Pegasus stares at Chibiusa in silence after telling her that waiting and believing is one form of love can take. A longer speech that included how Usagi should control her jealousy was added in the English dubbed episode to fill that scene.



  • This episode marks the final appearances of Yuuichirou Kumada and Grandpa Hino.
  • Yuichirou is shown to be jealous of Mamoru Chiba when he stays at the Hikawa Shrine. Although, Rei has a crush on Mamoru in the 1st season.
  • Despite the fight between Rei and Usagi who dresses as a kunoichi because of Mamoru, they have soon reconciled their friendship in the end when Usagi as Super Sailor Moon rescues her after being victimized by Tiger's Eye.
  • At the end of the episode, both Usagi and Rei became angered towards both Mamoru and Yuichirou because of their activities which Yuichirou apologizes to Rei because of her grandfather's chores while Mamoru also apologizes to both Usagi and Chibiusa for not helping them defeating the Lemure.
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