This manga has a good start and development, really.
Why do I think that? Usually, on mostly all the mangas I've read, the first chapter must show as much as it can to attrack attention of the magazine readers in just 32 or 48 pages. That brings us not paced starts, a too fast story. Here, on this manga, its doesn't happens: the first three chapters seems to be "slice of life" leaving there a few questions, and nobody expected the twist of the history on the 4th chapter, and the surprises and plot changes continue on the next chapters. And the fighting, the blood, violence... don't you think that this history pace is really good?