[3][non-primary source needed] It is the theme song to the TBS drama series S Saigo no Keikan, starring Osamu Mukai and Gō Ayano.

The first pressing of the single included a live take of "Koi wa Owaranai Zutto" recorded at the Kawaguchiko Stellar Theater on August 26, 2012 as a bonus track.

The CD single features two B-sides, including "Kimi no Taiyō ni Narō, which was used in television commercials for Seiko's Lukia watches, starring Emi Takei.

[9] The lyrics to the song depict an epic love story, using metaphorical references to the Pegasus constellation and the guiding star Polaris.

[10] CDjournal critics described the song as a "beautiful ballad" and praised Yokoyama and Misia for the "emotive" melody and for capturing the spirit of the drama series it is featured on.