for sure it is. theoretically you should be able to get it 2/3s done in the hard run and then just mop it up with one set of 3/8/9 chapter jumping.

and i was dreading that fight on hard! but it ended up being a lot easier than i expected because your characters are set up way better/you have improved skills. i think i still died to it once, but that's better than the 3 or 4 times i died the first time i fought it on normal. the house really ramps up the expectations for how you play the battle system.