What makes 21ji Made no Cinderella by Berryz Kobo notable?

The single reached number 4 on the Oricon charts, showcasing Berryz Kobo's immediate popularity and solidifying their presence in the competitive J-pop market. Its catchy title track became a staple of their live performances and helped to define the sound of their early career. Released on August 3, 2005, '21ji Made no Cinderella' marked Berryz Kobo's debut single, establishing them as a prominent group in the J-pop scene. This release came shortly after their formation in 2004, capitalizing on the idol boom in Japan and setting the stage for their future success.