Anemone should be the first to get those ampys. Her skill has the highest damage coefficient while she also has counterattack which based on defense. About manyu priority, I would say get 1 of your girl to 70 asap so that you can use the full potential of helpers squad. After that, it should be 6*-> 5* girls that can help you clear event map ->5*girls that can be useful. I would recommend refill stamina on manyu days at this stage