Formed in 2009, the band consists of three members: Avu-chan (vocals), Yashi-chan (bass), and Hibari-kun (guitar). Known for a distinctive vocal style that seamlessly shifts between high and low registers, as well as their original and overwhelming performances, they have garnered widespread attention not only within the music industry but across various fields.

Their song “Mephisto,” the ending theme for the anime [Oshi no Ko], surpassed 100 million cumulative streams on Billboard.

Both their physical and digital releases consistently rank high on music charts, and their live performances frequently sell out across multiple locations, solidifying their reputation as a band with both immense popularity and undeniable talent.