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I just finish all of the tasks, what about some of the scene said that I need to go back have other choose, is it possible for us to jump at that scene? For example 69 with sasha, even I finish all arc1, and tasks, but the scene just cant lock

I finished arc1, but I noticed that some scenes for some characters are not unlocked, should I start over (too time consuming), or is there any quick way to get to those specific scenes?