When Soma Violet Sayori Rose initially meets Future Aqua Hoshino and Future Ruby Hoshino, he implies that Future Aqua and Future Ruby had also wanted to become a Idols and kill Future Miyako Saitou, as Violet and Rose states after he meets Future Aqua and Future Ruby,

"You also wanted to do this, right?"

in reference to Violet and Rose killing Future Miyako just prior to meeting Future Aqua and Future Ruby.