"Ichirin no Hana" is the band's sixth single. It retained number two in the Oricon charts for most of the week of its release, making it the group's biggest hit since "Over", and even surpassed that single in sales. It is a rock song, blended with some rapping from Yūsuke. "Ichirin no Hana" was used as the third opening theme for the anime adaption of Bleach and was certified gold for shipments of over 100,000 by the RIAJ in January 2006. The title of the song is translated to English as "a single flower"