It is the theme song of the 2017 Warner Bros. Pictures live action film Fullmetal Alchemist.

[2] The song was written by Misia, with lyrics that portray the brotherly bond between the two main characters, Edward and Alphonse,[3] and composed by Los Angeles–based Japanese musician Ichi, and Mayu Wakisaka.

[4] "Kimi no Soba ni Iru yo" is written in the key of E-flat minor with a common time tempo of 128 beats per minute.

Following the release announcement, an accompanying music video, directed by Fullmetal Alchemist director Fumihiko Sori, was filmed at Toho Studios and premiered through Misia's YouTube channel on November 24, 2017.

[7] "Kimi no Soba ni Iru yo" debuted on the daily Oricon Singles Chart at number 27.