Triad Primus

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Triad Primus
Triad Primus Logo.png
General Unit Data
Original Name: Triad Primus
Members: Rin Shibuya
Karen Hojo
Nao Kamiya
Production Agency: 346 Production (anime only)
Debuted in: Cinderella Girls (anime)
Image songs: Trancing Pulse
Trinity Field

Triad Primus is a unit featured in THE iDOLM@STER Cinderella Girls anime adaptation, THE iDOLM@STER Cinderella Girls video game, and THE iDOLM@STER Cinderella Girls Starlight Stage. The unit consists of idols Rin Shibuya, Karen Hojo, and Nao Kamiya. They are affiliated with 346 Production in the anime.

Unit Costumes

CD Discographies

Game Discographies

THE iDOLM@STER Cinderella Girls

First appearance.

THE iDOLM@STER Cinderella Girls Starlight Stage

Debuted their second song: Trinity Field. It first appeared as an event song and later added to the player's list of playable songs.


Trivia and Fan Culture


  • Though they never decided on any fixed leader between them, the center position of the unit is usually held by Karen in the mobile game. After Rin held the center position in the anime, the unit's center position has become interchangeable between the three.
  • Being one of the most popular units in the franchise, Triad Primus ranked 1st as the best Cinderella Girls unit in survey results that were announced in the 6th Anniversary Mini Live, followed by LiPPS and Individuals in 2nd and 3rd place.
  • It has been somewhat a tradition that whenever Triad Primus appears as guests in Dereraji, they would "hijack" the program and become the hosts instead, with the real hosts becoming their "guests".

Fan Culture

  • Triad Primus has been unofficially considered as the core unit for the Cool-type idols, with its counterparts being Pink Check School for Cute and Positive Passion for Passion.
  • After the anime, it has been a running gag among the cast and the fandom that Rin would be labelled as an "indecisive traitor" to either Triad Primus or new generations, much to Rin's voice actor's chagrin.