Despite this success, it only managed to reach number two on the Billboard Japan Hot 100, being blocked by "Step and Go" from the boy band Arashi.

[3] In October 2007, Utada's song "Stay Gold" was unveiled in Kao Corporation's Asience shampoo commercials.

[5] Musically, "Heart Station" is a midtempo pop ballad that speaks about saying goodbye and still trying to reach somebody and maintain their presence in your life.

[7] She decided on this because she felt that radio stations had a hand-made, analog, loving and warm feeling to them, which resonated with the song matter.

[14] She was featured in many music and fashion magazines in Japan to promote the single, including issues of Pia, Patipati, CD Data, What's In?

[16] CDJournal reviewers were positive, praising in particular the song's backing vocals reusing the melody line (described as having a "tender floating-feeling"), and Utada's arrangement.

They felt that the song expressed sweet, sour and painful emotions, and praised the lyric "kokoro no denpa todoitemasu ka?"

[6][17] Takayuki Saito of Hot Express felt the work established Utada further as a sound creator, and praised her vocals, lyrics and the general "high level of perfection".

He felt that the most notable aspect of "Heart Station" was how Utada's raw, unprocessed vocals created a strong feeling of warmth.

[27] All tracks are written by Hikaru UtadaPersonnel details were sourced from "Heart Station" / "Stay Gold"'s liner notes booklet.