Cinderella Sengen!

 (シンデレラ宣言!; Cinderella Declaration!) is an idol group formed in November 2020.

They are the sister group of Schrödinger no Inu, Lateral Arc and a founding member of the Cinderella's Dog Project.

On July 10, 2021, the group announced their major debut under the label PONY CANYON. Their released their first major single on November 17, 2021.

On April 1, 2023 the group changed their name to SIN-SEN with the later's concept featuring a darker image along a heavy rock sound, the same day the group released their first single "AMULET" , the change was later revealed to be temporal and only until after their "Super April Fool's Festival 2023" concert the next day.

Members

 * YUNA
 * SUZU
 * RICO
 * CHINA
 * HARU
 * YUME (Joined March 3, 2021)
 * NUU (Joined March 3, 2021)

Singles

 * 1) [2021.11.17] Cinderella Sengen! / Asagao Shangri-La / Hanikami Sunset (シンデレラ宣言！/朝顔シャングリラ/はにかみサンセット)

Digital Singles

 * 1) [2021.01.18] Cinderella Sengen! (シンデレラ宣言！)
 * 2) [2021.04.04] Hyaku Thank You! (ひゃくてんきゅー！)
 * 3) [2021.05.12] 7-Kaime no One Piece (7回目のワンピース)
 * 4) [2021.05.12] DokiDoki! Heartbeat!! (DokiDoki！はーとびーつ！！)
 * 5) [2021.05.12] pastel shade
 * 6) [2021.05.12] Cinderella Kakumei -Revolution- (シンデレラ革命 -Revolution-)
 * 7) [2021.05.12] Kimiiro Fantasy (君色ファンタジー)
 * 8) [2021.05.12] Renai Labyrinth (恋愛ラビリンス)
 * 9) [2021.05.12] Niji (虹)
 * 10) [2021.07.16] 7-Kaime no One Piece (7Ver. remix) (7回目のワンピース (7Ver. remix))
 * 11) [2021.07.16] DokiDoki! Heartbeat!! (7Ver. remix) (DokiDoki！はーとびーつ！！ (7Ver. remix))
 * 12) [2021.07.16] pastel shade (7Ver. remix)
 * 13) [2021.07.16] Cinderella Kakumei -Revolution- (7Ver. remix) (シンデレラ革命 -Revolution- (7Ver. remix))
 * 14) [2021.07.16] Kimiiro Fantasy (7Ver. remix) (君色ファンタジー (7Ver. remix))
 * 15) [2021.07.16] Renai Labyrinth (7Ver. remix) (恋愛ラビリンス (7Ver. remix))
 * 16) [2021.07.16] Tsuioku Fragment (追憶フラグメント)
 * 17) [2021.08.18] day dream
 * 18) [2021.10.10] Momoiro Soda (ももいろソーダ)
 * 19) [2021.10.20] Cinderella Sengen! (7-nin Ver.) (シンデレラ宣言！(7人Ver.))
 * 20) [2021.11.03] Asagao Shangri-La (朝顔シャングリラ)
 * 21) [2021.12.09] Renjou Princess (恋情プリンセス)
 * 22) [2021.12.09] Time Leap (タイムリープ)
 * 23) [2022.04.04] Cinderella Sengen! Don't stop! (シンデレラ宣言！Don't stop！)