4:tune

 is a male idol group that debuted on September 9, 2021.

Current Members

 * Naoki (なおき; )
 * Rion (りおん; )
 * Izumi (いずみ; ) (Joined January 9, 2023)
 * Kanato (かなと; )
 * Touma (とうま; )
 * Sakuragi Kakeru (櫻木翔; ) (Support Member)
 * Ayato (あやと; ) (Support Member)

Former Members

 * Fumiya (ふみや; ) (Left September 2021)
 * Mizuki (みずき; ) (Joined May 2022; Graduated January 27, 2023)