Heya, glad you liked Yorna! As for 100% clear, my suggestion is optional quests like Ayane's line on the second island. If you already did it, then don't worry about this since you already beat the game.
I have, I know I've beat the game too. But I really would want to 100% it, and it seems to be a frequent issue that people cant 100% it either. Seeing by the comments atleast
It's something small like an optional mini-scene with dialogues. After developing Yorna for more than 3 years I can't remember all the stuff I put in it :>
