Ironically enough, charging "inside" the first two steps of Knockout In Three Steps is my preferred way of dealing with that spellcard. At least on normal mode, with Marisa/Patchy so I can switch to stone sign, getting right above her, you can bypass the whole massive bulletspam of the third step by getting in really close.
Think of it as "Oni can't punch you if you're standing on her shoulder."
...Knock Out...Now then... the first daughter has won through already...By reading the atmosphere, I will be able to win through this as well.After immobilizing them with lightning strikes, Iku makes a power dive!She keeps going with the Dragonfish Drill stance!!Skrrrhhh...