TIGHT

 is an idol group that originally debuted in November 2021. They were known as Byakuya no Kafka (白夜のカフカ) until July 2023 when the group disbanded and reformed with the same line-up + 1 new member. The group changed their name to TIGHT with the new line-up change.

Current Members

 * Tadase Nana (唯世夏凪) (Founding member)
 * Naruse Mikuri (成瀬みくり) (Joined March 2022)
 * Riria (リリア) (Joined March 2022)
 * Heri (妃理) (Joined September 2022)
 * Kanabe Natsuka (金戸なつか) (Joined July 1, 2023)

Former Members

 * Asukai Botan (飛鳥井ぼたん) (Joined March 2022; Left August 2022)
 * Meri (芽利) (Founding member; Graduated February 26, 2023)
 * Nishio Kaya (西尾華耶) (Founding member; Graduated February 26, 2023)