Well little girl, this video is full of blood... not good for our minds, haha, well... that's cruel life in that age from Japan, the age that made people must kill anothers to survive, and the strength of the spirit based on how many people she killed, but back to the present, I don't like that type of strength, when we believe in ourselves, that's how we gain the strong heart, I don't want the strength to eliminate my enemy (but I still need a bit ^^)
Someone said that : When we use the knive to stab someone, becareful because someday it will stab ourselves, just like the girl in your movie, each moment she kill, each fragment of heart she lost.She must strong to do her works, but so bad her works made her become weaker.
One more thing, animes, mangas or movies... almost from the mind of the producer 1st, and because the imagination has no limit, so sometimes the scene in the film is not suit with the reality ^^