It serves as the theme song for the film Demon Slayer: Kimetsu no Yaiba – The Movie: Mugen Train (2020).

[2] Lisa released "Gurenge" in July 2019, which served as the opening theme of the anime series Demon Slayer: Kimetsu no Yaiba.

[3][4][5] On August 2, 2020, "Homura" was announced as the opening theme song of the film version of the anime series Demon Slayer: Kimetsu no Yaiba – The Movie: Mugen Train, that was slated to be released on October 16, 2020.

"[3] Within the context of the film, the song is used as the character Kyojuro Rengoku's requiem, with the lyrics appearing to be from the perspective of his apparition.

The music video for the song, directed by Masakazu Fukatsu, was uploaded to Lisa's YouTube channel on October 14, 2020.

[12] The video features Lisa singing "Homura" on a solitary sea beach, against the backdrop of changing colours of the sky at the break of dawn.

In doing so, Lisa became the first female artist to earn the number one spot for two consecutive weeks since Kana Uemura's "Toilet no Kamisama" (2011).

With "Gurenge" climbing back to number two, LiSA simultaneously claimed the top two spots on the chart.