Kuro Gane started off with an interesting premise in v.1, coasted in v.2, and now that we've gotten through v.3, I have to ask. If he's got a talking sword who never seems to misunderstand him, and he eats and drinks and is wounded normally, exactly what is the point of making your hero a voiceless clockwork man? In the execution of the story, I'm not seeing any difference between Jintetsu and any other strong-and-silent samurai hero.
This does not make it a bad series, but it sure does not make it stand out from the competition.
Kuro Gane vol. 3 is also available from Right Stuf, Intl., an online retailer specializing in anime and manga.