TL DR; If you can bear gore this one is a must read
(I would recommend listening to "sowulo - SOL (2016) album" with your reading for full experience (fits with it like key and lock) )

story 10/10
I won't tell anything about the story so rest assured.

A Gory samurai age story as the cover implies (as the most of this genre) but:

1- with a bit of science fiction and some medical knowledge.
2- many arcs not long few boring ones
3-many characters so you are not only following a single protagonist but multiple characters so you not get bored
(and easy to follow don't worry).
4-Things become crazier as you read. Sometimes the roller
coaster slows a bit but then you are near a cliff edge of future excitement in the next chapters.
5-Not the typical samurai wisdom and says you won't get like other ones of this type of stories always contain but
a semi-modern modified type you will enjoy.
6-mind blow ending

Character 10/10
Another special about this Gem is the characters..everyone has their up and downtime and None is invincible
The dialogue is impressive and it what I liked most about the series. (as much as the main story of course)
Also, they are easy to follow from their way of speech and the character art.
Every character with a motive, backstory, principles and enough screen (ehm paper) time :D .

Art 9/10
This one is the best I have seen in art but next to Vagabond.
the manga beats Vagabond in every aspect except for the art can't deny it.
Every character is special and art gets better every chapter.
People look real Japanese and that shading is Gold quality.

Enjoyment 10/10
To describe it in one sentence (one more chapter manga and then I will stop)

Overall 10/10
Read the manga with the album mentioned above and It's a whole new experience