|Format CD single|
|Genre Pop, rock|
Label Evil Line/King Records
|B-side "Romantikku Kongaragatteru"
"Cha-La Head-Cha-La" (incl. on "Z" Ed. only)|
Released April 29, 2015 (2015-04-29)
" "Z" no Chikai " (「Z」の誓い, "Pledge of Z") is the fifteenth single by Japanese idol group Momoiro Clover Z, released on April 29, 2015. The title track is the theme song of the 2015 Dragon Ball Z: Resurrection 'F' theatrical film.
"Z no Chikai" is the theme song of the Dragon Ball Z: Fukkatsu no F anime film, which Momoiro Clover Z's members also perform in by voicing "angels from hell." The lyrics to the song were written by Yukinojo Mori and inspired by the Dragon Ball series.
The single was released in two versions; an "F" Edition (『F』盤) and a "Z" Edition (『Z』盤). The "F" Edition contains two tracks and their instrumental versions, a Blu-ray Disc of the title track's music video and has cover art depicting the group's members dressed as Dragon Ball character Freeza, while the back cover has a similar image as it would be seen through one of the series' "Scouter" devices. The "Z" Edition includes a cover of Dragon Ball Z's original opening theme song, "Cha-La Head-Cha-La" by Hironobu Kageyama, and an instrumental version in addition to the previous four tracks, with front and back cover art illustrations depicting the members in a Dragon Ball-style drawn by Toei Animation.
A shortened movie version of the song is included on the Dragon Ball Z: Resurrection 'F' original soundtrack released on May 8, 2015. An English-language version of the song has also been recorded for use in international versions of the film. Kanako Momota admitted that the English lyrics had to be transliterated into katakana so that the members could sing them.
The music video for "Z no Chikai" was directed by Masatsugu Nagasoe and takes its theme from Akira Toriyama's Dragon Ball universe with the members of Momoiro Clover Z dressed as its characters. Kanako Momota is dressed as Son Goku, Shiori Tamai as Vegeta, Ayaka Sasaki as a mix of Bulma and Trunks, Momoka Ariyasu as Chaozu, and Reni Takagi as Piccolo. All of them also dress as the villain Freeza towards the end of the video.
A short version of the video was released online on April 22, 2015, while the full version was uploaded on May 1. The single's "F" Edition includes the music video on a Blu-ray Disc.