Man with a Mission and Milet have previously collaborated in 2019 with the song "Reiwa" from Man with a Mission's 2019 studio album Dark Crow.
In February 2023 during a special stream, the opening song for the third season of Demon Slayer: Kimetsu no Yaiba was revealed.[1] On Twitter, the official account of Demon Slayer announced Man with a Mission and Milet would provide the song.[2]
On April 10, "Kizuna no Kiseki" was released to digital stores.[3] Subsequently, a music video for the song was released and a maxi single CD was announced for release on May 31.[4] Sony Japan later announced a limited vinyl version of the release.[5] The full 6-track maxi single was released on May 31, 2023.
A music video for "Kizuna no Kieski" was released on April 17, 2023. Directed by Yasuhiro Arafune, the music video primarily takes place atop the Tokyo Tower.[6]
Milet performed "Kizuna no Kiseki" at Nippon Budokan in May.[7] Man with a Mission was unable to perform live, however their studio vocals were used.[7] In June, Man with a Mission and Milet performed the song on the Japanese YouTube channel The First Take.[8]
^"『鬼滅の刃』第3期のOP主題歌発表 MAN WITH A MISSION×miletのコラボ新曲で映像公開" [Demon Slayer 3rd season OP theme song announced MAN WITH A MISSION x milet collaboration new song released video]. ORICON NEWS. February 3, 2023. Retrieved June 22, 2023.
^ ab"『「鬼滅の刃」刀鍛冶の里編』miletとMAN WITH A MISSIONによるED主題歌配信+OP主題歌MV公開" [Demon Slayer Swordsmith Village Edition milet and MAN WITH A MISSION deliver ED theme song + OP theme song MV released]. BARKS (in Japanese). April 17, 2023. Retrieved June 22, 2023.