Stage 5 unlocked for Practice in Lunatic EoSD with Reimu B. I sure was happier when I accomplished this in IN and PCB. At those times there were just a few mistakes where I said "That was dumb, get rid of those and you'll clear it", but this time there were hardly any really dumb mistakes, more things where my lack of skill would be to blame. This is unsettlingly discouraging and motivating at the same time, I guess.
Edit: Actually, I think I can do this. The strategic parts of stage 5 seem to be somewhat easy to figure out, at least I've got a fairly solid approach in mind for most of them already. At this rate, stage 4 will probably be the decisive factor since there's only so much that strategy can do there, but I'm pumped!