7 Girls War is the debut single and title track by Wake Up, Girls!, a seven-member voice actress unit formed for the anime franchise of the same name. Composed by Satoru Kosaki and Hidekazu Tanaka, with Tanaka also handling arrangement, and written by lyricist Bon Karaya, the song served as the opening theme for episodes 3 through 12 of the Wake Up, Girls! television series. The original single was released in 2014, several years before its appearance in a rhythm game. In maimai, 7 Girls War was added to the MURASAKi version on March 23, 2017, under the POPS & ANIME category. It was later removed from the arcade rotation on July 11, 2019, making it one of the earlier delisted tracks in the series. The in-game play background does not use footage from the anime's opening sequence; instead it draws from the background assets of Miracle Girls Festival, a separate rhythm game featuring the same characters. The recording features a full live band, guitarist Hiroshi Iimuro, bassist Takashi Adachi, drummer Shigenobu Ikeda, with piano and organ by sugarbeans and chorus support from Junko Tsuji. Brisk at 180 BPM, the song's energetic J-pop arrangement mirrors the anime's themes of determination and self-discovery. In maimai, the Master chart (designed by はっぴー) and Expert chart (designed by 某S氏) carry that energy through dense clusters of Slide and Break notes at a relentless tempo.