Sakura Gakuin
Prior to the album's release, Babymetal performed as a sub-unit for the Japanese idol group Sakura Gakuin from 2010 to 2013, and music that would be included surfaced as early as October 30, 2010, when the members of the band recorded their vocals for their first song "Doki Doki ☆ Morning". From 2011 to 2013, the band released five singles inside and outside Sakura Gakuin, with the most successful single, "Ijime, Dame, Zettai" peaking at number six on the Oricon Weekly Singles chart.