Yes, I believe you do have to progress the story. I have all four and only did it recently, but how they spoke seemed like you get the message/thought to go back (during evening) just after your rescue at Sakura Town.
drdreeds66
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See, I don't know if I made a different choice or what during my first play through, but each opportunity I get to take a walk in Littanos, either Dynae accompanies me and that's it, or "I need to talk to the soldiers". Since you suggested it, I went and rapidly attempted each walk opportunity many times each so even if there is only a 10% chance, like I saw somebody say for Gifrix encounter, surely I would have gotten it. Either I'm very unlucky today or we are missing something...
P.S. Also, I interpreted wander around as take a walk as it is in Littanos. The next opportunity you get to wander around in the actual camp location, you are already at Yalen. Maybe that info might help.
6ood6ame gave the perfect explanation 2 months ago.
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For a long time I could not find 3 and 6 scenes in the game, so I give a guide to people with the same problem. These scenes are located immediately after the last battle in Yalen, (do not choose "Skip Yalen", choose "Skip prologues") after it you are given to go to any tent, you need to immediately head to Nadine. After a short dialogue you will be given the choice "Let her relieve you" or "Go back to your tent", depending on which option you choose, the third and sixth scenes will open. If you do not have any scene open, you can ask me, I have all the scenes.
(thx google translate)
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I finally got the third scene for myself today too