Akiko Yoshida is a Japanese singer and songwriter performing under the stage name Kokia. Her most well known songs are "Arigatō..." and "The Power of Smile" (which topped at No. 8 in the singles chart). She is also recognized for her numerous contributions to anime/game soundtracks, the most notable being "Ai no Melody/Chōwa Oto " for the film Origin: Spirits of the Past, "Follow the Nightingale" for the game Tales of Innocence, "Tatta Hitotsu no Omoi" for the anime Gunslinger Girl: Il Teatrino, "Dance of the Spirits" for the anime “Ancient Magus' Bride” and "For Little Tail" for the game Tail Concerto.

"The Power of Smile/Remember the Kiss" is Kokia's 10th single, released on September 24, 2003. It is currently Kokia's most commercially successful single, after being used as the Kao Essential Damage Care shampoo commercials in 2003, featuring actress Yūko Takeuchi.