Bad Friends (バッド・フレンズ, Baddo Furenzu) is a 2009 tribute album, is kade from Akuyū (悪友), which translates to "Bad friend" and is the origin of Yū Aku's name. The final track, "Kawahara no Ishikawa Goemon" was originally recorded by Eiichi Ohtaki (under the pseudonym "Niagara Fallin' Stars") on his 1978 album Let's Ondo Again. This version is performed by Kanzashi (簪, lit. "Hairpin"), which consists of then-AKB48 members Mayu Watanabe, Haruka Nakagawa, Aika Ota, and Natsumi Hirajima, plus Pink Lady member Mie. The song incorporates the melodies of the Pink Lady songs "Nagisa no Sindbad", "S.O.S.", "Wanted", "Carmen '77", "Pepper Keibu", and "UFO".