 In early 2008, SID announced they would be going major with Sony Records and later put out "Monokuro no Kiss" (モノクロのキス), their debut major single.The single’s title track was used for the opening of anime "Black Butler" and the release was also available in four versions, one which was a special Kuroshitsuji version featuring the two main characters on a cardboard sleeve.Their debut concert at Nippon Budokan sold out in under two minutes in November 2008.