In this run I start out from the final save spot in the dungeon of Fou-lou's Castle. From here I equipped the holy mantle to keep the random enemy encounters to a minimum while I rushed down a series of stairs. After some dialogue you fight against Fou-lou, Tyrant, and Astral. During the dialogue you have to choose the "I don't know" or "You're Wrong" answers to avoid being persuaded into joining Fou-lou and destroying your party.
I let the credits and let the epilogue play through after all of the final battles.