Written by Tokunaga and Keiko Asō, the single was released through Apollon on October 25, 1988.

[1][2] Tokunaga co-wrote "Saigo no Iiwake" after experiencing a painful breakup with someone he was dating at the time.

As a result of the breakup, he involuntarily shed tears while performing the song on the TBS music show The Best Ten.

[4] All music is composed by Hideaki Tokunaga"Saigo no Iiwake" has been covered by Midori Karashima, Satoshi Furuya, Ruru Honda, and Junko Yamamoto.

Outside Japan, the song became popular in the Philippines, when it was covered by Ted Ito as "Ikaw Pa Rin", Keempee de Leon as "My One and Only", Maso as "Kailanman" in Tagalog and "Come Back Home" in English, and as an instrumental by saxophonist Jake Concepcion.