Treble

 is a rock/metal idol group formed in November 2020. They debuted on December 29, 2020.

Current Members

 * Daibousoutenshi Ruri (大暴走天使るり) (Original Member)
 * Yabatanien Juria (八葉谷苑じゅりあ) (Joined December 29, 2020)
 * Usui Matsuri (雨水まつり) (Joined September 20, 2021)
 * Sakuu Iru (朔羽いる) (Joined April 22, 2023)

Former Members

 * Komaki Mako (恋舞姫まこ) (Original Member; Graduated March 16, 2022)
 * Moegi Yunon (萌木ゆのん) (Original Member; Graduated March 25, 2022)
 * Reiki Meru (麗忌める) (Joined September 20, 2021; Graduated April 15, 2022)
 * Kakuzatou Miruku (隠咲兎羽みるく) (Joined April 15, 2022; Graduated July 12, 2022)

Mini Albums

 * 1) [2023.03.07] The absolutes of sin
 * 2) [2023.03.14] Heart on the brink

Singles

 * 1) [2020.12.29] Dance of Death
 * 2) [2021.12.24] Death friends
 * 3) [2023.03.07] Ano Shigai to Fuantei na Raspberry (彼の死骸と不安定なラズベリー)