The song was written by Eilish and her brother Finneas O'Connell, who also produced the track for Darkroom and Interscope Records.
On April 12, 2024, in an interview with Apple Music's presenter Zane Lowe, Eilish teased a 15-second snippet of "Chihiro", which was released on her third studio album Hit Me Hard and Soft (2024).
[1] The song's title is a reference to Chihiro Ogino, the main character of the 2001 Studio Ghibli animated film Spirited Away.
[2] In an interview with Angie Martoccio of Rolling Stone, Eilish said:[3] The song is loosely based off of that movie, which is one of my favorites.
[23] Despite viral success, a remix named as "MTG CHIHIRO" by Mulú was initially denied permission for releasing on streaming platforms by Billie Eilish's management, including her brother Finneas.
[26] It combines the track with Brazilian funk elements and gained significant popularity on social media platforms, particularly TikTok,[27] where it became the soundtrack for the "passinho CHIHIRO" dance.