The first sub-group from E-girls are ShuuKaRen, which consists of sisters Karen Fujii from Happiness and Shuuka Fujii of Flower.[93] This is the first musical release to feature both siblings together, after first distributing their fashion coffee table book Antithese, which garnered critical success and sold over 100,000 units in Japan.[94] LDH conceived ShuuKaRen as "two vocal divas" that create music "based on black [culture]".[95] Their debut single, "Universe", was released on 5 October 2016, and features co-lead vocals by Shuuka; this is the first time Shuuka has provided vocals to any E-girls related effort, and is the first overall member from the group since Ruri Kawamoto to be promoted as a vocalist.[96]