Quite ambivalent about it after 3+ volumes.

On one hand, the story is clearly not coasting: in each volume Something Happens (somebody dies or is significantly changed, or we learn more about the lore).

On the other hand: there were several times where I wondered whether some pages were missing, the transitions from one scene to another could have been better. I often don't understand exactly what's happening in action sequences. Also the story doesn't escape some tired tropes: the hero has amazing skills thanks to his lineage, and a lot of female/third-gender characters are attracted to him for no apparent reason. They're also naked or almost naked at some point. The characters look a lot like each other. Even a grandmother looks like a teenager.

After having read several other mangas by Tsutomu Nihei, it's fun to find new iterations of previous elements though: the gaunas, Toha Heavy Industries, the ominous masks, a bear...