Function: works for me
Story: You are a ronin. (Masterless samauri) You are a very deadly ronin to be precise with your inhuman skills with a kitana.
Opinion: I quite enjoyed the entire series with me once thinking it was probably just a glorified Japanese story as of course the main idea being about Samauri. I was quite wrong. Not only is it the typical chaos you'd expect from a story like this but plenty of depth and personality in the characters and plot.
[Worth noting]
This specific story is the introductory story meaning it will lack in some areas to funnel you into the next one. That isn't to say it is lacking however as it is quite good on its own too.
[Whole story]
You can spend days or maybe a few weeks reading it all with great interest as I did and even grow a bit of an attachment to the story and its characters. Gotta say the author is very consistent with the character's personalities.