"STUPiG" is the ninth single (fifth major) released by BiS. The single was released in nine versions: two CD+DVD versions (one containing the music video, another containing all episodes of Backstage idol story), a CD only version, and six music cards. All three main versions came in both limited and regular editions. The single reached #7 on the Oricon charts and charted for two weeks. It is Koshouji Megumi's debut single.