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.

On May 16, 2022, it was announced that the current structure will end on June 17.

Current Members

 * Otsuka Mio (大塚美青; ) (Original Member; Graduating on June 17, 2022)
 * Saito Haruka (斉藤春香; ) (Original Member)
 * Sakura Riina (佐倉リイナ; ) (Joined October 2020; Graduating on June 17, 2022)
 * Kuraki Meru (椋木芽瑠; ) (Joined October 2020; Graduating on June 17, 2022)

Former Members

 * Unezawa Ayaka (釆澤彩香; ) (Original Member; 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