Its actually good and I think that the reason why it is a fast paced story is because it is really straight forward. Like, the plot is not running in circles and makes the readers more confused and i like that in some story.
The art is also good and I pretty much like the concept of this, having a mascot the one who kills is actually a brilliant idea. I just wish it was longer since I wanted to see more bonding of the brothers
Pygmalion