Tri-Sphere

 is a Japanese idol girl group formed in October 2018. They made their debut in May 2019. Their producer is yUsUke.

In October 2020, they started a 5-member system until Unezawa Ayaka graduated from the group on September 1, 2021.

Current Members

 * Otsuka Mio (大塚美青; )
 * Saito Haruka (斉藤春香; )
 * Sakura Riina (佐倉リイナ; ) (Joined October 2020)
 * Kuraki Meru (椋木芽瑠; ) (Joined October 2020)

Former Members

 * Unezawa Ayaka (釆澤彩香; ) (Graduated September 1, 2021)

Albums

 * 1) [2020.03.25] TRI-ANGLE

Singles

 * 1) [2019.09.18] PRIZM
 * 2) [2019.10.16] triangle relation
 * 3) [2019.11.13] Eternity
 * 4) [2019.12.13] starlight
 * 5) [2020.08.27] Sphere of Light
 * 6) [2020.11.11] same as you
 * 7) [2021.06.30] Seize the Moment / Spica
 * 8) [2022.01.26] ever lost