What makes 6th Otakebi Album by Berryz Kobo notable?

The album features the hit single '雄叫びボーイ WAO!', which contributed to Berryz Kobo's continued presence in the top charts of Japan. It reflects the group's ongoing influence within the J-pop genre during a period marked by changing musical trends, solidifying their status as prominent figures in idol culture. Released on January 1, 2010, the '6th Otakebi Album' marks Berryz Kobo’s transition into their later career phase, following their fifth studio album. By this time, the group had established themselves as a staple in the J-pop scene since their debut in 2004, continuing to refine their sound and appeal to their growing fanbase.