Can anyone tell me does the Ch.1_Ep2 contains all previous contents? Cus I took a look at the development log and It seems like this game has 7 episodes at first as a prologue then the next updates changed version to Ch.1_Ep1. I'm a little confused, and the patch called Emma's Solo Ending. What's the use of it? Do I have to download it for a full playthrough? Sorry for the dumb question, I'm new here :) .
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If you download the latest version (currently being Chapter 1 - Episode 3 (Part 1)) you have access to all the previous parts of the story, plus the Emma solo ending all in one archive.
The solo ending is an alternate ending, not necessarily canonical, but it's a worthy experience. To access it you have to choose the option to fullfil the promise that the MC made with Emma. This option opens up after the raid to Hera's home.
I advise to save before choosing that option if you also want to see the other half of the story.