I'm having the same issue as Aruphic down below. It's where Fulana is coming back from the cave in the ice world. She doesn't want to go back into the room with Lien and Fern so it makes you go through the debris because of the crystal that's blocking the path. After that, the game basically ends as you get Bad Ending A... Wondering how to get past this? Also wondering if you need both of the 'Last Notes' to progress this part?