Girl Next Door is the first album from Girl Next Door released on December 24, 2008. It was released in two versions, a Normal Edition and an Album+DVD version. Both versions had a first press which included a slipcase and one of two photobooks. For the first time in the world of music, all the songs included in this album are tie-up to the media such as drama series, television shows, or commercials.
The album is certified platinum by RIAJ for shipment of 250,000 copies.