Good originality, theme, and setting. Sadly as story goes, too much plot gone to waste. I could say failed plot development and character development. Story twist mights seems good, but there is only few good counter plot solution to it.
The protagonist seems to be doing nothing from my perspective (yet miraculously accomplish something) , even towards the end (except for finishing). Only few character got significant character development. Plot development revolve more upon the 'surrounding' rather than the 'character development' so much that if you were to analyze it properly, sometimes it will seems illogical here and there, especially with the development.
At first I put much hope in this manga, but it eventually failed my expectation. Art is changing as story goes, but on overall almost stay on the same level. Nevertheless, if you got nothing to read, might pick this one up as side manga.
Rather than one whole story, it would be nicer if they are separate stories with different character each time revolving around a main plot. The author is indeed great (I like some parts of it), just that this work seems to be rushed or not properly planned.