What makes S/mileage Best Album Kanzenban 1 by Angerme notable?

The album is notable for encapsulating the group's early sound that resonated with fans, leading to chart success; it peaked at number 3 on the Oricon Albums Chart. It also solidified Angerme's presence in the idol music genre during a time when girl groups were gaining prominence in Japan. Released on May 30, 2012, this best-of album marked a significant moment in Angerme's career, following their rebranding from S/mileage. At this point, the group had already established themselves in the J-pop scene with several hit singles, and this compilation highlighted their evolution as they gained popularity.