Oyasumi Sekai

 (おやすみセカイ) is an idol group that debuted in February 2017.

Current Members

 * Kawai Meu (可愛めう) (Joined July 2020)
 * Mikanagi Ruru (御巫るる) (Joined November 2021)
 * Konose Noa (恋瀬のあ) (Joined December 2022)
 * Ebichou Mai (蝦煠まい) (Joined June 2023)

Former Members

 * Amatsuka Milky (天使みるきぃ) (Founding member; graduated September 2017)
 * Shirosaki Mayu (白咲まゆ) (Founding member; graduated September 2017)
 * Kamiya Jurina (神谷じゅりな) (Founding member; graduated February 2018)
 * Rikapi (りかぴ) (Founding member; graduated February 2018)
 * Raimu Miu (来夢みう) (Joined October 2017; graduated February 2018)
 * Sakuragawa Mika (桜川みか) (Joined February 2018; left June 2018)
 * Emo (えも) (Joined February 2018; graduated August 2018)
 * Kino Ririka (城乃りりか) (Joined February 2018; graduated August 2018)
 * Kurumizawa Yuzu (胡桃澤ゆず) (Joined July 2018; left August 2018)
 * Kisaragi Moe (如月もえ) (Joined February 2018; fired October 2018)
 * Shiina Mio (椎名美桜) (Joined July 2018; graduated October 2018)
 * Chida Umino (千田羽海乃) (Joined November 2018; graduated March 2019)
 * Kusunoki Reina (楠木れいな) (Joined February 2018; graduated April 2019)
 * Torase Miyako (虎瀬美也子) (Joined November 2018; graduated April 2019)
 * Minagawa Yuuka (皆川優香) (Joined November 2018; graduated April 2019)
 * Hoshino Miru (星乃美流) (Joined April 2019; left May 2019)
 * Howata Kotone (穂綿ことね) (Joined April 2019; left February 2020)
 * Kurosaki Sakura (黒崎さくら) (Joined April 2019; left February 2020)
 * Mashiro Rima (真城りま) (Joined April 2019; left February 2020)
 * Akakuri Seina (明栗聖奈) (Joined April 2019; left February 2020)
 * Sakura Momo (桜もも) (Joined February 2020; graduated April 2020)
 * Nakamoto Seina (中本星七) (Joined February 2020; graduated April 2020)
 * Ogawa Nene (小川寧々) (Joined February 2020; left May 2020?)
 * Kamijou Rin (上條りん) (Joined February 2020; left May 2020?)
 * Ichinose Riru (一ノ瀬りる) (Joined July 2020; left September 2020?)
 * Himeno Fuyu (姫野ふゆ) (Joined July 2020; left December 2020)
 * Minami Sayaka (美南さやか) (Joined November 2020; left February 2021)
 * Nowan Moe (雪餅羽もえ) (Joined November 2020; graduated August 2021)
 * Amatsuka Ruria (天使瑠璃亜) (Joined February 2021; left September 2021)
 * Kou (小雨) (Joined February 2021; graduated March 2022)
 * Fujisaki Ria (藤咲りあ) (Joined July 2020; graduated April 2022)
 * Medeaizuki Neru (愛逢月ねる) (Joined November 2021; graduated April 2022)
 * Hoshijima Mana (星嶋まな) (Joined January 2021; graduated October 2022)
 * Kokona Mogana (心那もがな) (Joined February 2021; graduated October 2022)
 * Usagi Yuyu (兎木ゆぅゆ) (Joined December 2022; graduated May 2023)

EPs

 * [2019.09.28] Oyasumi Dekinai Gozen 2-ji! (おやすみできない午前2時!)