What makes Monochrome no Kiss by SID notable?

The title track 'Monochrome no Kiss' became a significant hit, reaching high positions on the Oricon charts and contributing to SID's rising popularity. This album marked a pivotal moment for the band, as it was featured as the opening theme for the popular anime series 'Black Butler', further extending their influence within both music and anime cultures. By the time SID released 'Monochrome no Kiss' in 2008, they were transitioning from their indie roots to mainstream success. This album followed their breakthrough with 'Use Once and Destroy' and solidified their presence in the Japanese rock scene, reflecting their artistic growth and wider appeal.