@Chiryuu2609 Forgive me if I didn't fully understood your question, but you want a summary of what happened in each Episode story-wise, I assume? Or did you mean content updates per Episode? Or maybe both? Or perhaps something in the direction of nerfs, buffs, balancing related stuff per Episode?
If it's story, AzureBlaze has Episode 1 through 4 written down on his website and made a start on Episode 5. Sadly, it's not a summary though. My apologies for that.
Last time I checked the dialogues, events, script, context, etc. are all well covered. (With use/help of the fan translation I assume. I could be wrong.) All Pre-Episode 5 content is present in the form of their Matterboard- and Storyboard eras. So nothing edited, cut, added or restructured. Everything preserved in their original state.
Do note, it's not an easy read due how AzureBlaze has structured it. I don't blame him though, I don't think I would have done a better job. It's up to you if you wanna read it all.
- Green Text: Speculation.
- Red Text: What the player does/The official "Party Line".
- Bold Text: Important information.
- Blue Text: Choice Options.
- Purple Text: Dates & Times.
There are some parts that happen 'in-between' the chapters, I haven't secluded them from the 'chapter' list below.
All credits go to AzureBlaze and whoever helped him.
Episode 1 [The Beginning of the Matterboard.]
Episode 4 [The Beginning of the Storyboard.]
Episode 5 [The Beginning of the Omnibus structure.]
I'll let someone else summarize the 'other' parts if 'story' wasn't what you asked for. (Perhaps you're better off watching a walk-through or full story play on YouTube instead of reading it all, unless someone is willing to summarize it.)