REOL is a Japanese electronic group that consists of vocalist/lyricist/composer Reol (???), producer GigaP (??P), and movie producer Okiku (??). The members of REOL previously worked as solo artists; Reol and GigaP collaborated for his album No title-, and Reol released an album ??? which featured GigaP among other composers and arrangers. REOL signed to TOY'S FACTORY as a group in 2015, using Reol's name for the project, and released their debut album ? (Sigma) on October 19, 2016.