Started off quite slow and with a setting/characters that's been done to death which was a little off-putting, but holy heck was I surprised at how this evolved. Takes a bit to get to that point but trust me, it's so worth it. Out of any series of this kind it is definitely at the absolute highest tier. As mentioned, little bit of minus points on the slow start but even that bit is pretty good, it's just that it becomes so much better later on that it the first bit pales in comparison.