This is my first review and I am doing it in order to improve how I judge the anime I watch. Thus, I am sticking to the story/art/sound/character/enjoyment rating, because I think it is a good way to categorize rating.
Story - 9/10
First thing, the story has a great apresentation because it is not presented to the viewers from the start. During the movie, you start to understand what is going on. This is so well done that the story progresses without become complicated, to the point that, by half of the movie, you can completely understant it. This presentation makes you curious about what the plot is and unable to leave the screen.
The themes adressed by the movie are very diverse, some are very common and others, not that much. The supperficial theme of the main characters is the common trust and friendship theme, but analysing deeper the story, you get to see more profound themes like, ambition and redemption.
Also, one more thing I would like to say, that made me love the story, is that every screentime given to a characters is important, that being for his development or for the justification of how he will act in future events.
Art - 10/10
The animation was one of te things that led me to watch this movie and I can say I am not one bit disapointed. The animation is perfect. It is very detailed and very fluid, something very evident during the epic fight scenes.
The art is simple yet beautiful. The design of the characters and the ambient, which are very detailed, accomplish the mission of setting you in the Segonku period.
Sound - 10/10
I am not an specialist in dubbing, but it sounded perfect to me. Also the dubbers' voice, in my opinion, matched perfectly with their characters.
Now about the soundtrack, boy, what a soundtrack. It not only set the tone, together with the animation and art, making you feel like you are in the medieval Japan, but it also set the tone for the various moments of the movie, they being moments of epicness or moments of sentiment.
Characters - 10/10
As the story, in the beggining you do not know much about the characters, what gives space to some character developing, and how it is well done. All the main characters, and some of the secundary ones, are presented either with a great and sentimental background or with their own ambitions and objectives, which were so well told that made me care about those characters. Also, with that development, all their actions and their behaviours become very understandable.
One more thing, during the movie, the relation of the two(or should I say three) main characters is so naturally developed and so enjoyable that i could not help it, but to cheer for the victory.
Enjoyment - 10/10
The combination of an animation and art beatiful for the eyes and relations between characters that progress so naturally makes watching the movie a very good experience, but the main reason of its enjoyability are the fight scenes. Those happens in various points of the movie and act to keep you thrilled until the end of the movie, which happens with one of the more gorgeous and epic fight scenes ever.
The fight scenes in the movie are epic , very fluid, very detailed and well choreographed. Like that, any one of them, from the first to the last, pushes you to the edge of excitment.
Overall - 10/10
The combination of the various good aspects of the movies makes it really easy to watch it. Not just that. It actually makes it a truly fantastic experience. That being, in my opinion, this is definitely a must-see.