Yandoll

 (病ンドル) is a 'yami kawaii' (lit. sickly cute) group that debuted on July 20, 2015.

They have a trainee sister group called #111111SICK.

History
2015= 2016= 2017= 2018= 2019= 2021=
 * In April, 2015, Aina Aoyama graduated from Ayaman JAPAN and set out to create an idol group with the only requirement being that the applicants had to be 'suffering'.
 * Out of over 1400 auditions, Usami Mico, Kisaragi Kila, Kurumi Ruku, Hasumi Ichika, Asahina Maron, and Tsukiyama Suziran where chosen. On July 20, 2015, the group officially debuted as Yandoll.
 * That same day they performed a live show alongside Oyasumi Hologram and LADYBABY.
 * On September 26, 2015, Hasumi Ichika graduated from the group and held her last live. Just four days later, members Asahina Maron (to avoid being hospitalized by her doctor into a mental clinic) and Tsukiyama Suziran also graduated.
 * The group held a second audition, and on January 23, 2016, they revealed three new members, Haruna Nanaha, Takanashi Mayu, and Karei Ruu.
 * On March 16, 2016, during a live that was being held on Kurumi Ruku's birthday, she announced plans to graduate. Half a month later, Yandoll announced another audition that would be taking place from May 1st until May 21st in order to fill Kurumi Ruku's spot.
 * Kurumi Ruku held her last live show on April 26, 2016, and officially graduated from the group in order to concentrate on her studies.
 * On May 25, 2016, an audition was held through the streaming platform SHOWROOM, but none of the applicants were selected.
 * On September 25, 2016, Usami Mico graduated from the group due to family reasons.
 * On October 29, 2016, Hyuga Hiyu joined the group.
 * On December 29, 2016, their first album "THEクビ!" was released, with a goal of 5,000 sales. If this goal was not reached, someone from the group would be fired. But they reached the goal on April 1, 2017, so the line-up remained the same.
 * On February 12, 2018, Kisaragi Kila, Takanashi Mayuu and Haruna Nanaha graduated in the same day.
 * On February 13, 2018, Nagase Uni joined the group.
 * On May 19, 2018, a trainee group called #111111SICK (High Sick/ハイシック) was created, and an audition for it was announced.
 * On August 21, 2018, Shizuku Rui was promoted from #111111SICK as a regular member. On the same day, Theta Amu was also promoted from #111111SICK, but as a 3-month temporary member.
 * On October 17, they had their major debut with Universal Music, releasing their first major single, ANKH.
 * On November 21, 2018, it was announced that #111111SICK member Matoi Kiru would be promoted to Yandoll, starting from January 2019.
 * On December 1, 2018, #111111SICK member Torii Suzume was offered to be promoted to Yandoll, but she declined the offer and left #111111SICK.
 * On January 1, 2019, Matoi Kiru joined the group.
 * On January 14, 2019, Theta Amu suspended activities to focus on medical treatment.
 * On May 20, 2019, Theta Amu left the group.
 * On August 24, 2019, Shizuku Rui announced her withdrawal from the group.
 * On October 2, 2019, #111111SICK member Mitsugi Ringo was promoted to Yandoll.
 * On November 26, 2019, Karei Ruu, Hyuga Hiyu and Nagase Uni graduated in the same day.
 * On January 24, 2021, #111111SICK members Hinata Hana, Shinonono Shion and Ma Sara were promoted to Yandoll.

Current Members

 * Matoi Kiru (纏きる) (Joined January 1, 2019)
 * Mitsugi Ringo (恋空りんご) (Joined October 2, 2019)
 * Hinata Hana (ひなた花) (Joined January 24, 2021)
 * Shinonono Shion (偲ノ乃しおん) (Joined January 24, 2021)

Former Members

 * Hasumi Ichika (蓮水一夏) (Original Member, Graduated September 26, 2015)
 * Asahina Maron (朝日奈まろん) (Original Member, Graduated September 30, 2015)
 * Tsukiyama Suzuran (月山寿々蘭) (Original Member, Graduated September 30, 2015)
 * Kurumi Ruku (胡桃るく) (Original Member, Graduated April 26, 2016)
 * Usami Mico (宇佐美みこ) (Original Member, Graduated September 25, 2016)
 * Kisaragi Kila (如月きら) (Original Member, Graduated February 12, 2018)
 * Takanashi Mayuu (小鳥遊まゆう) (Joined January 23, 2016, Graduated February 12, 2018)
 * Haruna Nanaha (陽菜菜々羽) (Joined January 23, 2016, Graduated February 12, 2018)
 * Theta Amu (θあむ) (Joined August 21, 2018, Left May 20, 2019)
 * Shizuku Rui (しずく涙) (Joined August 21, 2018, Left August 2019)
 * Karei Ruu (華麗るぅ) (Joined January 23, 2016, Graduated November 26, 2019)
 * Hyuga Hiyu (日向ひゆ) (Joined October 29, 2016, Graduated November 26, 2019)
 * Nagase Uni (ながせうに) (Joined February 13, 2018, Graduated November 26, 2019)
 * Ma Sara (舞さら) (Joined January 24, 2021, Graduated December 16, 2021)

Albums

 * 1) [2016.12.29] THE Kubi! (THEクビ!)

Indies Singles

 * 1) [2015.07.20] Mirai Sekai (ミライセカイ)
 * 2) [2016.04.08] sgrks
 * 3) [2016.05.11] Crime

Major Singles

 * 1) [2018.10.17] ANKH
 * 2) [2019.07.20] Equality