The process to unlock Rollo's story has changed:Ok, now it managed to get even worse, since the quest (Strong & Soft) is not even appearing on the menu anymore (this is part 6)
And when I try to talk to Rollo after his fight, it says "unlock Strong & Soft part 3", which might not be done and even if it can, I don't know how because it's not on the menu
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Progress through Zoey's Story ("In Sunrise shadows") until you can ask her if she knows Rollo, after that his story will appear in the Notes menu. Defeat Rollo in episode 2 and everything should be unlocked in his dialogue in episode 3. Let us know if you still have problems.