Friend/Sugao no mama

"Friend"/"Sugao no mama" (Friend/素顔のまま) is a single by Japanese singer-songwriter Rina Aiuchi. It was released on 17 December 2008 through Giza Studio, as the second single from her seventh studio album Thanx. The double A-side single reached number eight in Japan and has sold over 12,383 copies nationwide. "Friend" served as the theme song for the Japanese television show Ongaku Senshi ~Music Fighter~.

Certification and sales
! scope="row"| Japan (RIAJ)
 * None
 * 12,383
 * }
 * }