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Alright then, time to grind grind grind and hope my levels don't end up too out-of-balance :C
Did those levels mean you don't have a comander? If so you're seriously gimping yourself.
Have one underleveled as comander and one in party, just except they will die alot; more than that becomes a liability.
Alice is the only deicated tank.
Sakuya's private square is so broken that it ends up being near essential, it can prevent scripted spells.
Don't think Nitori is needed, or Aya, Marisa is probably necessary, due to odd damage type.
I really wish Byakuren and Mokou will magically required at some point so that they'll SHOW UP IN CUTSCENES. I miss them so much ;.;
Stage 10 and 12 according to pooshlmer
For Satori:
Get petrification resist gear. Or use Reimu , she can block or heal it if you put points in her healing/ barrier skills (esp. the 16 point one, which gives healing spells the ability do get rid of permanent effetcs)
Beware her healing herself to full as well.