"Ren'ai Revolution 21" (or "Renai Revolution 21") (恋愛レボリューション21, Renai Reboryūshon Nijūichi, Love Revolution 21) is Morning Musume's 11th single, and was released December 13, 2000. It sold a total of 986,040 copies and peaked at number two on the Oricon Charts. The lead vocals of this single are Natsumi Abe and Maki Goto. This single also marks the last with Yuko Nakazawa before she graduated from Morning Musume to pursue her solo career within the Hello! Project. The dance appeared in the PV and their live performance was choreographed by Natsu Mayumi.