"Pocket" is Ai Otsuka's 16th (17th overall) single released under the avex trax label. It is her third (fourth) single to be released in 2007. This is her first single to be released after her fourth album, approximately two months after Love Piece. This is Otsuka's first original single since her debut single "Momo no hanabira", which sold 44,822 copies, to sell less than 100,000 copies.
