"Egao no Mama de" was written and produced by Ryoji from Ketsumeishi, while its title was chosen by Ueto.

[1] The song marks Ueto's second consecutive collaboration with Ryoji, who also wrote and produced "Kaze o Ukete" (2005).

[3] The theme of the song is growth and its lyrics were inspired by the cherry blossom season, which is commonly associated with encounters and separations.

[4] The music video features a scene in which Ueto gets a drastic haircut to reflect her personal growth.

[4] "Egao no Mama de" debuted on the Oricon Daily Singles chart at number 8 on February 14, 2006, and peaked at number 15 on the Oricon Weekly Singles chart, with 9,546 copies sold in its first week.