The walkthrough is confusing, I wish there is a straightforward one, basically one tailored for each route and each scene. Putting them all together in one pdf really mess with your head trying to determine where the flow is going. Made the wrong decision, had to start over from all the way back even with save load.
That is on you.
This is a gigantic VN and you should save at every decision.
If you didn't, your fault.
The walkthrough is sometimes hard to follow, mainly because of how many branches there are and how different Blake behaves.
But again, saving should be a no-brainer.
Writing a walkthrough for every single route would be a project as big as making the game itself.
There are a few key points in some branches that determine specific branches that are mentioned to late, but if you already play with a walkthrough, spoilers shouldn't be an issue, so reading ahead is recommended.