Debut single release from new Johnny's Jr. unit Hey! Say! 7 featuring members Yuto Nakajima, Yuri Chinen, Ryosuke Yamada, Daiki Arioka, and Yuya Takaki. Group name taken from the years of the members' births (Heisei) plus the year of the group's formation (2007). Single appears as the new intro and outro themes to anime series "Lovely Complex." Includes three new songs plus three karaoke versions for a total of six track.