"Flash" (stylized as "FLASH") is a single by Perfume, released on March 16, 2016. It is the fifth single from their fifth studio album Cosmic Explorer. The single reached first place in the real-time ranking of iTunes with 200,000+ downloads. It is also the band's highest selling single since "Love the World". The single was used as the theme song for the live action adapted film Chihayafuru.