"Jane Doe" is a song recorded by Japanese singer-songwriter Kenshi Yonezu and Japanese-American singer-songwriter Hikaru Utada. Released digitally on September 22, 2025, via SME Records, "Jane Doe" served as the closing theme song for the Japanese animated film '. The song was later released physically on September 24, 2025, alongside "Iris Out", the opening theme song, as a double A-side maxi single.
In a press release on July 4, 2025, Kenshi Yonezu announced he recorded "Iris Out", the opening theme song for the Japanese animated film '. Yonezu previously provided his song "Kick Back" as the opening theme song for the anime series of Chainsaw Man, which saw global success and later became the first song recorded in Japanese to receive a Gold certification from the Recording Industry Association of America (RIAA). On August 1, the release date of "Iris Out" was announced for September 24, as a double A-side single with an untitled song. The title for the untitled song was revealed on August 14, "Jane Doe", as a collaboration single with Japanese-American singer Hikaru Utada. In a press release, "Jane Doe" was revealed as the ending theme song for the film.
"Jane Doe" was released on September 24, 2025, alongside "Iris Out" as a double A-side single. Three variants were released: the regular edition, the Iris Out edition, and the Jane Doe edition. The Iris Out variant includes an acrylic stand and a Polaroid photo of the character Reze from Chainsaw Man as bonus goods, while the Jane Doe version consists of a DVD of the "Kick Back" music video and a live performance. First press bonuses for all variants include a serial number for a lottery in winning tickets to Yonezu's 2026 Ghost Tour.
On September 23, a music video directed by Tomokazu Yamada was released on Yonezu's official YouTube channel.