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: THE iDOLM@STER: Cinderella Girls
Image songs: Trancing Pulse
Trinity Field

Triad Primus is an idol unit featured in the Cinderella Girls anime, the Cinderella Girls game and Starlight Stage. The unit consists of Rin Shibuya, Karen Hojo, and Nao Kamiya. They are affiliated with 346 Production in the anime.

Unit Costumes


Game Discography

THE iDOLM@STER: Cinderella Girls

First Appearance.

THE iDOLM@STER Cinderella Girls: Starlight Stage

Debuted their second song: Trinity Field. It appeared as an event song but was 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 Triad Primus is usually held by Hojo Karen in the mobile game. After Rin held the center position in the anime, Triad Primus' 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' (Save Fukuhara Ayaka, Rin's VA.)

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 Fukuhara Ayaka' chagrin.