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It looks like this was an issue caused by the cloud saves interfering with the configuration files. Cloud saves were temporally disabled for episodes 1 and 2.

To fix the black screen, please open the Galaxy Client, click the game, click MORE > Manage installation > Show Folder.

On Windows:
Remove the save directory and launch the game again.

On Mac:
Right-click on the WORLD END ECONOMiCA episode.01 select Show Package Contents, remove the save directory and launch the game again.

Same procedure applies to episode.02.

We apologize for the inconvenience.