That was a really fun fight with Great Stamp. And a long one. Reimu lv66, fought it just after finding it.
Alice dealt some damage while debuffing ATK, which I never let go below -32% until she died near the end. Meiling tanked first slot and could take hits easily, Remi concentrated on tanking slot 2 with a little damage, switching out for WrigglePSN now and then. Youmu/Nitori/Patch were switched in/out for nukes, Patch died after 1 Silent Selene though. Reimu did lots of DEF/MND buffing and healing, usually switched out instantly, as were attackers because loldelayandfrailness.
That's about it, really. The other characters only got to move like once each during the whole fight :V (Demarcation, Miracle Fruit, Promise of Wheat God), it was mostly just whittling down his HP with PSN and Youmu/Nitori nukes. PSN probably did half or more of the damage in this fight.
I don't even need 4 of the characters in this party :]
Oh yeah, I should go fight Moko-tan and Yuyucow now. And, uhh, get out Marisa for sparking Resurrection.
EDIT:Piece of cake with Mokou, and didn't need to bring Marisa. Patch took her turn instantly after Resurrection, Selene'd and switched her out, Meiling and Remi survived. Switch in Nitori and Youmu, boomroasted. Woo, and Kaguya is already avaliable! Goodbye and good riddance, Sanae. I'll keep Reisen for the 16F fight.