81moment

 (read as Eight One Moment) is an idol group formed in August 2015.

Current Members

 * Murasaki Futaba (村咲ふたば) (Joined August 2017, graduating August 2021)
 * Takanashi Ayaka (小鳥遊彩花) (Joined June 2020)
 * Mochimiya Riyo (餅宮りよ) (Joined June 2020)
 * Onzai Nia (音済にあ) (Joined December 2020)
 * Aizawa Hina (相沢ひな) (Joined June 23, 2021)

Former Members

 * Noda Erina (野田えりな) (Joined August 2015, graduated February 2016)
 * Shimizu Riko (清水理子) (Original Member, graduated April 2016)
 * Ayase Ai (綾瀬愛) (Original Member, Graduated June 2016)
 * Igarashi Mau (五十嵐茉優) (Original Member, graduated July 2016)
 * Harasawa Mao (原澤稀音) (Joined Unknown, graduated December 2016)
 * Haruno Emiri (春野絵実莉) (Original Member, graduated May 2017)
 * Shiina Narumi (椎名成美) (Original Member, graduated August 2017)
 * Amatsuka Milky (天使みるきぃ) (Joined August 2016, graduated September 2017)
 * Sakurai Nanamo (櫻井ななも) (Joined August 2017, left March 2018)
 * Shirayuki Kotori (白雪ことり) (Joined August 2017, left March 2018)
 * Shinonome Reika (東雲れいか) (Joined August 2016, graduated August 2018)
 * Minagawa Yuuka (皆川優香) (Joined June 2018, graduated November 2018)
 * Tennouji Haru (天王寺ハル) (Joined February 2017, graduated February 2019)
 * Kamiya Jurina (神谷じゅりな) (Joined November 2018, graduated May 2019)
 * Hidaka Fumika (日高ふみ夏) (Joined April 2019, left May 2019)
 * Tachibana Karen (立花かれん) (Joined July 2019, left July 2019)
 * Aratani Moa (新谷もあ) (Joined April 2019, graduated October 2019)
 * Nakamoto Seina (中本星七) (Joined November 2018, graduated April 2020)
 * Natsume Risa (夏目りさ) (Joined July 2019, graduated June 2020)
 * Kanade Rio (奏りお) (Joined August 2019, graduated June 2020)
 * Momose Mai (百瀬まい) (Joined June 2020, left August 2020)
 * Hinata Hinano (ひなたひなの) (Joined June 2020, left August 2020)

Singles

 * [2017.05.16] UTAGEI / Kiseki wa Sude ni Umareteru (UTAGEI／奇跡はすでに生まれてる)

Digital Singles

 * [2021.01.30] Shine
 * [2021.02.12] Trigger
 * [2021.03.01] Kimi ni Countdown
 * [2021.03.28] SAKURACHIRU