Okay, after a certain time skip, this manga starts to decline in quality, there's lots of references to mythology and Shakespeare's work as well. But they come across as not well utilised, and well if you don't use those aspects well, than you can't blame people for thinking it's pretentious because it shows you don't how to use those quotation or elements well. The princess suffers great character regression, although there are reasons, those reason wasn't enough for some readers to enjoy it. The cheesy romcom subplot has damaged the story greatly. A new character being introduced to the cast didn't help either. Another complaint, as how they explain some origins of the world's current state being outlandish (self-aware), although it comes as jarring with no robust reason or strong thought behind.
Also the concept of destiny and coincidence are used as plot convenience too many times, even the explanation for it is very convenient
This manga uses so much explanation, that some explanation have been repeated TOO MANY times, within a short time span, it's like they thought of it and then we see what they thought being shared to someone else, although it's fine from the character point of view, for readers we can't but for that deja vu feeling, since we seen already in short time span. Repeating explanation or dialogue too much time gets grating, irritating as well. Sometimes they list different type of mythos that leads to same conclusion, which gets bloated with unnecessary dialogue that readers already understand the message. Also the creator, even put a dictionary meaning on some words on panel which is not good eye flow. Some authors are smart and put it a footnote instead, people read manga for art and story, not to read definition out of a dictionary dedicated to a single panel.
Also, I find the main 2 characters, indifference hypocritical, they don't care about others death that many would be shocked, but were affected fuwa, this is not spoiler since it's in beginning of the description, I mean most mourn about others that are close to them, but they won't bat an eye or just don't care, no traumatic experience, they are high school students for goodness and when Fuwa dies, they consider everyone else insignificant which is unrelated and not well written and makes them feel unrealistic in a certain. They are capable of emotion just towards other is the main problem so you can't call them robotic completely. Their reason revolve around fuwa which I find more strange given her dis-likeable personally which is described by the two, but Fuwa isn't all bad which confuses me even more.
This is one of my least favourite manga and think it had such potential as well.