Subset of Babymetal.
Formed by Moametal and Yuimetal, only credited on songs without Su-metal such as おねだり大作戦 (Onedari Daisakusen) and 4の歌 (Song 4).
During live performances, Moa and Yui put on hoodies with a skeleton print to highlight the change from Babymetal to Black Babymetal.
