Upon release, A Song to the Sun was financially successful and helped launch Yui's music career.

In addition, Yui also won the Best Newcomer Actress at the 30th Japan Academy Film Prize for her role.

Several adaptations of the film were made, including a 2006 television series, a 2018 American remake, and stage plays.

As her medical condition begins to worsen over time, she loses feeling in her hands, and is unable to play guitar.

With a painful expression that fades quickly, Kaoru's father tries to convince her that if she takes off the suit, it cannot bother her anymore, and that she could run around freely.

The premium edition includes a bonus disc with nearly 90 minutes of making-of footage, deleted scenes, the music video for the song "Good-bye Days", and interviews with Yui, Takashi Tsukamoto and the film's director.

[2] He also complimented the film's method of highlighting Kamakura without relying on tourism clichés and the actors' performances.

[2] In 2006, a television drama adaptation of the same name aired on TBS, starring Erika Sawajiri and Takayuki Yamada.

[4] The theme song, "Taiyō no Uta", was performed by Sawajiri and released under the name Kaoru Amane as a tie-in, which also helped launch her solo singing career.

A South Korean musical theatre adaptation ran in 2010, starring Girls' Generation member Taeyeon as Kaoru.

[8] A Japanese stage play titled Taiyō no Uta: Midnight Sun ran from September 5–9 and October 10–14 in 2018, starring Hinata Kashiwagi as Kaoru and Yudai Tatsumi as Koji.

[10] In May 2015, writer Eric Kirsten announced an American adaptation of the film titled Midnight Sun, which is centered on Washington, USA.