Y'know, I got this kinda early on. 2 crit/dh Hyoshos and a crit/dh raiton. And then I tried beating it, because this was pretty bad all things considered. Eventually I thought I could burst him down in phase 2 and spent like an hour on that - and I did, eventually, before learning that he's actually hard stuck at 0.1% and dies upon landing in phase 3. Still haven't beaten this run. And so the moral of the story is - Just be lucky, 4Head.