Apostrophe

 (アポストロフィ) formerly known as Aficionado (アフィシャナドゥ) and later Aficionado deux (アフィシャナドゥdeux), is an idol group formed on August 2, 2021. They held their pre-debut live on August 10, 2021.

On April 10, 2022, they announced that they would end their current system on May 4, 2022 and four members would graduate. The day after, on May 5, they revealed their new lineup and changed their name to Aficionado deux.

On November 8, 2022, they announced that they would once again end their current system at the end of November 2022, and that they would rebrand as a new group and additional members.

On December 23, 2022, Aficionado officially restarted activities as Apostrophe, along with the addition of a new member.

Current Members

 * Sena Ayano (瀬那彩乃; ) (Joined August 20, 2022)
 * Akabane Miki (赤羽美妃; ) (Joined August 20, 2022)
 * Tsukishiro Mio (月城澪; ) (Joined December 23, 2022)

Former Members

 * Oshima Kotomi (大島琴未; ) (Founding member; Graduated December 7, 2021)
 * Tachibana Mizuki (橘みずき; ) (Founding member; Graduated February 19, 2022)
 * Tsukishima Kana (月島かな; ) (Founding member; Graduated February 19, 2022)
 * Yamamoto Mao (山本茉央; ) (Founding member; Graduated May 4, 2022)
 * Doi Rena (土居麗菜; ) (Founding member; Graduated May 4, 2022)
 * Takamatsu Airi (高松愛莉; ) (Founding member; Graduated May 4, 2022)
 * Kurusu Kanon (来栖花音; ) (Joined February 3, 2022; Graduated May 4, 2022)
 * Kawaguchi Marin (川口真凜; ) (Joined May 5, 2022; Graduated August 9, 2022)
 * Kase Airi (加瀬藍梨; ) (Joined May 5, 2022; Graduated August 19, 2022)
 * Yokoo Yuuhi (横尾有柊; ) (Joined February 19, 2022; Graduated September 6, 2022)
 * Okawa Rio (大川莉央; ) (Founding member; Graduated September 26, 2022)
 * Haru Sarina (春さりな; ) (Joined October 21, 2022; Dismissed November 8, 2022)
 * Hanano Sana (花乃さな; ) (Joined May 5, 2022; Graduated February 18, 2023)
 * Nagano Uran (永野宇蘭; ) (Joined November 27, 2022; Graduated July 7, 2023)

Trivia

 * Doi Rena and Oshima Kotomi had a concurrent position in the idol group Ange et Folletta.
 * Tachibana Mizuki and Takamatsu Airi held a concurrent position in Artemis no Tsubasa, but graduated to become solely members of Aficionado.