from what i see in the raws, Aoi is in fact in love with Shizuku and not Saki. Also in the last chapter update, it seem that Saki had a bad experience with a girl before who dump her for a boy and by pure coincidenceshe catch a glimpse of Aoi and Shizuku speaking together and blushing, in addition of Shizuku kinda avoiding her after the festival's statement. The chapter with Shizuku and the little bro crying because i think Shizuku might thought Saki might hate her.