Dancing Dolls is a group of Japanese pop singing women with ages varying in the late teens and they performed the song, monochrome for the opening of the Soul Eater Not! anime and later released in three versions through the various releases of their 5th single, "monochrome".
Dancing Dolls was formed by a group of childhood friends in Osaka, Japan when they first started performing in the streets in Osaka Castle Park, which apparently, is social gathering for street performances. The girls wrote/composed their own songs as group memeber, Misaki choreographed the dances. the group eventually began uploading dance covers to internet video media sites and achieved some what success. as their videos became popular, totaling over 10 million views by the time of their professional debut in 2012, Dancing Dolls were signed by Sony Music Entertainment of Japan on September 12, 2012. released their debut single, titled "Touch -A.S.A.P.- / Shanghai Darling".At the time, the group's average age was 16. They went on to make various songs including one for anime, Soul Eater Not!.
Dancing Dolls performed the opening theme, monochrome for the anime series in three different versions: first being the full version, the second being the instrumental theme and the third is an anime/opening version of the song only released in the limited edition of the previously mentioned album