"Memory Seishun no Hikari" (Memory 青春の光, Memory: The light of youth) is the fourth single from the J-pop idol group Morning Musume, released on February 10, 1999 as an 8 cm CD. It sold a total of 410,850 copies, and reached number two on the Oricon Charts. In 2004, it was re-released as part of the Early Single Box and again in 2005 as a 12 cm CD. Lead vocals of this single were Natsumi Abe and Asuka Fukuda. Prior to this singles release, on January 17, 1999, Fukuda shocked viewers of the television show Asayan with her decision to "graduate" from Morning Musume and continue with her studies.