" Its pretty hard to compress multiple novel chapters full of information, character dialogues and thoughts into a single manga chapter and have it make sense."
This is why that job is generally left to professional scenarists, instead of the hamfisted highschooler attempt at a plot summary this shitsekai displays.
Although in this case it's a boon to humanity, given that it allows people to take it and point out: "See?!! This is how not to write a story.." to any aspiring writer with delusions of literacy.