Tsundere’s often have the general wish (not perse tanabata) to be able to be more honest with their love interest. However Sakurako seems not to be aware that she is a tsundere. The song ‘Koi no double punch’ seems to indicate that she actually doesn’t know what a tsundere is. So who knows what goes on in the little gremlin’s head :) Probably wishing for something bratty and short sighted like getting to eat her favorite food tomorrow.