Henpukumaru's fighting style involves using a chain to either choke out or disarm feir opponent and then possibly finishing them off with a blade. I liked this fighting style and very much enjoyed the fight scenes. I also appreciated the context and backstories. Nice, solid storytelling that does a good job of getting us invested in the characters, who are otherwise honestly somewhat bland.
I don't really have any major complaints about the manga, but it also didn't really excite me all that much. Still probably worth reading at least once, especially if you're a fan of manga about feudal-era Japan and ninjas.