I understand that part, but the delivery insofar has been convoluted at best. Maybe it's an adaptation medium issue, but I don't feel like the manga laid out the crux of the conflict that well.
I'll be honest I lost track of what the story is about roughly 10 chapters ago.
ohhhh I see.... they are just putting more details and more characters on this but next chapter should explain everything.
But think like the original game was supposed to all of this happen while MC (Rae) is romancing one of the prince, and then during the revolution the prince ascend as a king and the nobility + Claire get executed.
They are showing more details how it happened and all, the revolutionary group working with Salas but now getting betrayed, Salas actually supporting the Empire that is taking advantage of the situation to make themselves take a piece of the pie that will be after this chaos.
Basically The Nobility is being exposed as corrupt, the Royalty is supporting the revolution because they want non of this shit, and because of that the Nobility needs to pay the price by being executed.
There are more details that now would be a spoiler but thats mostly whats going on.