During a KAT-TUN spring concert on April 3, 2007, Johnny's Juniors Yuya Takaki, Daiki Arioka, Ryosuke Yamada, Yuto Nakajima and Yuri Chinen were named to be part of a new group called Hey! Say! 7. Initially, the temporary status of the group was unclear, worrying a lot of fans of Johnny Jr's groups J.J. Express as it could mean that the group was splitting up and that Yuya Takaki and Daiki Arioka would permanently be in this group instead.
On June 16, 2007, it was announced that Hey! Say! 7 would release "Hey! Say!" as a single on August 1, 2007. While the A-side "Hey! Say!" was used as the second opening song for the anime Lovely Complex, the single's B-side "Bon Bon" was used as the second ending song for the same anime. The single went on to sell 120,520 copies in its first week, making the group the youngest male group to top the Oricon singles chart.
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