12 Starium

 (12星座リウム), also known as Starim (スタリム), is an idol boy group that debuted in August 2019. The concept of the group is "Star signs and constellations" and their fans are called "Observers" (Kansokusha; 観測者).

The group held regular performances every Tuesday and operated the "Starim Cafe" (スタリムカフェ).

The group disbanded on June 28, 2022

Final Line-Up

 * Moriyama Tsuduri (森山綴; ; Leo) (1st generation)
 * Kawahara Shunta (河原隼大; ; Libra) (1st generation)
 * Matsuda Taiki (松田大輝; ; Gemini (2nd generation)
 * Fujisawa Tomoya (藤澤智也; ; Aries) (3rd generation)
 * Suzuno Hayato (涼野ハヤト; ; Cancer) (3rd generation)

Former Members

 * Amane Sora (天音そら; ; Virgo) (2.5 generation, Graduated Late 2020)
 * Juki (じゅき; ; Aquarius) (2nd generation, Graduated on February 6, 2021)
 * Manato. (Sagittarius) (1st generation, Withdrew November 24, 2021 )

Digital Albums

 * 1) [2020.03.26] Futari Dake no Sekai (ふたりだけの世界)
 * 2) [2021.09.05] ORION

Digital Singles

 * 1) [2020.09.30] Sentimental (センチメンタル)
 * 2) [2020.09.30] Idol Jishukuchu (アイドル自粛中)

Singles

 * 1) [2020.12.22] STARLIGHT STORYS