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Japanese electronic music duo renowned for high-energy J-pop and anime theme songs.Formed in 2002 by composer/producer Satoshi Yaginuma. Initially an indie group with vocalist Nao (2002–2009), later rebranded with Yoshino Nanjo as vocalist (2009–2020). Currently features rotating vocalists including Satomi Sato. Known for hit anime openings like 'only my railgun' for A Certain Scientific Railgun.

• Original vocalist Nao abruptly left in 2009 due to creative differences, nearly disbanding the group before Yaginuma recruited Nanjo.
• Their 2009 debut single 'only my railgun' became a viral sensation, selling over 100,000 copies and defining the 'electro-anime' sound of the 2010s.
• Yoshino Nanjo's departure in 2020 shocked fans; she cited health issues from the group's demanding schedule as the primary reason.
• Despite multiple vocalist changes, Yaginuma maintains fripSide's signature sound through his synthesizer-heavy production and melodic style.