ARP: A 4-member dance and vocal group created by the latest AR technology. This popular group got their start with Avex, and are unique for their interactive concerts which combine highly-skilled song and dance routines with a format that changes based on how much the fans are cheering them on. (Source: Crunchyroll) ARP: A 4-member dance and vocal group created by the latest AR technology. This popular group got their start with Avex, and are unique for their interactive concerts which combine highly-skilled song and dance routines with a format that changes based on how much the fans are cheering them on. (Source: Crunchyroll)