The developer of Naninovel now supports an integration with Adventure Creator. So you can now include visual novel style dialogue or cutscenes
Naninovel makes use of a very writer friendly format, including visual scripting. So a sequence of dialogue written like this:
Mary: This is my line of dialogue.
Bob: And this is my line of dialogue.
...Becomes your lines of dialogue in game, although of course there's much more to it than that, say if you want animated portraits or something.
Naninovel is still in Beta but the developer is very consistent with updates and support. I am using it for longer cutscenes currently.
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