This manga turned out be a big disappointment even before I started to notice that.
So far the manga can be divided into 3 parts:

I. Chapters 1-43 (Four main battles): The story started off fast-paced, impressive and very promising with a cool lead character, who was reckless, decisive, and reliable in any situation. There were creative twists during the battles and many types of weapons were showcased.

II. Chapters 44-66 (Only one main battle): The pacing became slower, the chatting exhaustively longer, and the fights simpler, more predictable, effectively reduced to merely slashes and thrusts. Enemies died faster and in less splendid ways.

III. Chapters 67-last (Many mini-battles): By this point, the story became extremely slow. It's more talking and bragging than fighting. Characters' traits became inconsistent, and ultimately indistinguishable. Events became so absolutely mediocre that no one can expect to see anything new. In short, from this point the manga became even worse than that crappy Bleach.