111111SICK

#111111SICK (pronounced High Sick; ハイシック) is an idol group formed on May 19, 2018. They are the trainee sister group of Yandoll.

History
2018= 2019= 2020= 2021-2023=
 * On May 19, 2018, the group was created and an audition for it was announced.
 * On August 21, 2018, Theta Amu was promoted to Yandoll, originally as a 3-month temporary member.
 * On August 31, 2018, Uruu Mae left the group due to personal reasons.
 * On November 21, 2018, Matoi Kiru was promoted to Yandoll, after winning a popularity contest for 3 consecutive months. She would start in that in January 2019.
 * On December 1, 2018, Torii Suzume was offered to be promoted to Yandoll after winning a popularity contest, but she declined the offer and left #111111SICK.
 * On January 30, 2019, Ichigono Taruto left the group.
 * On March 24, 2019, Fukai Nemuri and Mitsugi Ringo joined the group.
 * On April 15, 2019, Otonashi Abiko joined the group.
 * On June 22, 2019, Otonashi Abiko left the group.
 * On July 19, 2019, Kuujo Non, Tanabata Nana, Sakenogare Maika, and Youchi Rari joined the group.
 * On July 21, 2019, Misaki Rose and Shiretsu Mishi left the group.
 * On July 27, 2019, Hanazono Miru left the group.
 * On September 1, 2019, Akemi left the group.
 * On September 27, 2019, Tanabata Nana announced that she has new plans and that she would leave the group in 30 days, with her last live being held in that same day.
 * On September 30, 2019, Kuujo Non left the group to focus on her gravure work.
 * On October 1, 2019, Rikorisu Sou joined the group.
 * On October 2, 2019, Mitsugi Ringo was promoted to Yandoll.
 * On October 6, 2019, Fukai Nemuri left the group.
 * On January 1, 2020, Shinomiya Anzu joined the group.
 * On March 2, 2020, Rikorisu Sou announced that she would be leaving the group on March 22.
 * On March 7, 2020, it was announced that Rikorisu Sou was dismissed after violating the rules. In that same day, it was also announced that Suzu, Hana, Shion, Sara, and Sora would join the group.
 * On June 25, 2020, Sora stopped tweeting and hasn't appeared again since. Though no official announcement was made, it indicates that she left the group.
 * On June 28, 2020, it was announced that Shinomiya Anzu, Youchi Rari, and Suzu would be leaving the group.
 * On July 20, Sakenogare Maika performed her last live and left the group.
 * On January 24, 2021, Hana, Shion, and Sara were promoted to Yandoll. The group entered a hiatus.
 * On August 3, 2022, the group returned with 5 new members: Azami, Sayo, Momota, Ena, and Saiko.
 * On October 24, 2022, Manon joined the group.
 * On January 1, 2023, Chamu joined the group.
 * On January 8, 2023, Yumeshi joined the group.
 * On February 19, 2023, Manon withdrew from the group.

Current Members

 * Azami (アザミ) (Joined August 3, 2022)
 * Sayo (さよ) (Joined August 3, 2022)
 * Momota (ももた) (Joined August 3, 2022)
 * Ena (えな) (Joined August 3, 2022)
 * Saiko (さいこ) (Joined August 3, 2022)
 * Yumeshi (ゆめ氏) (Joined January 8, 2023)

Former Members

 * Shizuku Rui (しずく涙) (Original Member; Promoted to Yandoll on August 21, 2018)
 * Theta Amu (θあむ) (Original Member; Promoted to Yandoll on August 21, 2018)
 * Uruu Mae (閏まえ) (Joined July 2018; Withdrew August 31, 2018)
 * Torii Suzume (鳥居すずめ) (Original Member; Withdrew December 1, 2018)
 * Matoi Kiru (纏きる) (Joined August 2018; Promoted to Yandoll on January 1, 2019)
 * Ichigono Taruto (苺野たると) (Original Member; Withdrew January 30, 2019)
 * Otonashi Abiko (音無あびこ) (Joined April 15, 2019; Withdrew June 22, 2019)
 * Misaki Rose (美咲姫ローズ) (Original Member; Withdrew July 21, 2019)
 * Shiretsu Mishi (しれつみし) (Joined August 2018; Withdrew July 21, 2019)
 * Hanazono Miru (花園みる) (Original Member; Withdrew July 27, 2019)
 * Akemi (あけみ) (Withdrew September 1, 2019)
 * Tanabata Nana (たなばたなな) (Joined July 19, 2019; Withdrew September 27, 2019)
 * Kuujo Non (空条のん) (Joined July 19, 2019; Withdrew September 30, 2019)
 * Mitsugi Ringo (恋空りんご) (Joined March 24, 2019; Promoted to Yandoll on October 2, 2019)
 * Fukai Nemuri (腐海ねむり) (Joined March 24, 2019; Withdrew October 6, 2019)
 * Rikorisu Sou (彼岸花ソウ) (Joined October 1, 2019; Fired March 7, 2020)
 * Sora (そら) (Joined March 7, 2020; Left June 25, 2020)
 * Youchi Rari (ようちらり) (Joined July 19, 2019; Withdrew June 28, 2020)
 * Shinomiya Anzu (紫乃宮あんず) (Joined January 1, 2020; Withdrew June 28, 2020)
 * Suzu (すず) (Joined March 7, 2020; Withdrew June 28, 2020)
 * Sakenogare Maika (サケノガレマイカ) (Joined July 19, 2019; Withdrew July 20, 2020)
 * Hana (はな) (Joined March 7, 2020; Promoted to Yandoll on January 24, 2021)
 * Shion (しおん) (Joined March 7, 2020; Promoted to Yandoll on January 24, 2021)
 * Sara (さら) (Joined March 7, 2020; Promoted to Yandoll on January 24, 2021)
 * Manon (まのん) (Joined October 24, 2022; Withdrew February 19, 2023)
 * Chamu (ちゃむ) (Joined January 1, 2023; Fired April 12, 2023)