It starts pretty interesting and quite mysterious but gets more and more confusing towards the last published chapters. Unfortunately it's *not* finished, so at the moment - although promising - it doesn't make a lot of sense.
Even though the art style is not very spectacular, the storyline is simply amazing. there are different philosophies here and there on top of already complex events. However, it gets complicated in the end, I found myself getting lost. But maybe it is because this manga is not finished yet.