"Utsuroi" (移ろい, "Changing") (stylized UTSUROI) is the 49th Japanese CD single by South Korean pop duo Tohoshinki, first digitally released by Avex Trax on July 31, 2022, and then as a CD single on August 17, 2022. "Utsuroi" was released in three physical versions – a standard CD only version, a limited photobook edition, and a fanclub edition released exclusively for Tohoshinki's Japanese fan club, Bigeast. Promoted as a summer single, "Utsuroi" is described as a medium-tempo ballad song reminiscent of Japanese city pop, accompanied by a vocal harmony. Lyrically, the song is about cherishing one's closest friends, and to strive towards a better future together.
"Utsuroi" was announced on June 26, 2022,[1] on the last day of Tohoshinki's fanmeeting tour, The Garden Tours. A preview of the song was revealed on YouTube on July 13, which also included a teaser trailer for the album jacket's photoshoot.[2] The album jackets and the single's B-side track "The Reflex" were revealed on July 17,[3] A preview of "The Reflex" was revealed on July 24.[4] "Utsuroi" was digitally released on July 31, 2022.
A teaser video of the single's accompanying music video was released on YouTube on August 13,[5] and the music video dropped on August 14 at 12:00 PM JST.[6] The digital single and CD single were officially released online and nation-wide on August 16. A "lip version" of the music video was released on August 17.[7] As "Utsuroi" was the duo's first Japanese single in two years, Tohoshinki appeared on various radio station programs from August to September 2022 to promote the single.[8]
