fripSide is a Japanese music duo formed in 2002, known for their contributions to the anime and video game music scenes. The group originally consisted of vocalist Nagi Yanagi and composer Satoshi Yaginuma, but later transitioned to a new lineup featuring Nao Tokisawa as the vocalist. Their music often blends electronic and pop elements, creating a distinctive sound that resonates with fans. The duo gained popularity for their theme songs in various anime series, including the well-known A Certain Magical Index. Their energetic performances and catchy melodies have earned them a dedicated following, making them a prominent name in the Japanese pop music industry.