Gain is an EP released by the Japanese band Sadie on 30 December 2009. It was issued in two editions: a regular edition with the bonus track "Regret" and a limited edition with a DVD containing the music video for "Ever" in a slipcase.
Track listing "Ever" – 4:58 "Brain Core" – 4:39 "Beauty Shadow" – 4:41 "Chaotic World" – 3:30 "愛しさは孤独の支配者 [Itoshi sa ha Kodoku no Shihai Sha]" — 4:44 "Regret" – 4:44
Personnel Mao – vocals Mizuki – guitar Tsurugi – guitar Aki – bass guitar Kei – drums