Story: 7/10
As the synopsis suggests, the story centers heavily on fighting and action, so there's not that much story development. All you need to know is that the two clans are trying to kill each other. This doesn't dampen the anime in any way since it was intended as an action anime, but I think there was a major issue with pacing. It was both rushed and painfully slow at the same time. By rushed I mean the story needs to kill off 18 characters (there's 10 for each side and obviously it's going to be 1v1 at the end) in a mere 24 episodes. This means many of the characters barely contribute anything to the story (some of them honestly only appear for 10 min and then they die), and I think the story would've been a lot better had they reduced the number of characters per clan. But I know the producers didn't have much control over this since it was based on the manga, but then I wish they would have extended the series to be longer to allow more story development for each character.
But it was also painfully slow for the action scenes. You'll notice moments in the fights where the two foes just stand and stare at each other for way too long. Normally that kind of stuff builds anticipation, but here they exaggerated it way too much and it gets to the point where you just want the action to start already.
If they had just fixed these minor pacing problems, the story would have been fantastic. And just keep in mind that this anime is dark; you won't find many comedic scenes that usually come with action anime.
Art: 10/10
I definitely liked this kind of animation style, even though this was my first time watching a historical anime. The people and environment are all nicely drawn, and there's definitely a focus on very dark colors, reflecting the tragic mood of this anime.
Sound: 10/10
I think the opening and ending themes were nice, as well as the various themes used in the sad moments. There's also a flute tune which serves as an emotional motif which I thought was extremely fitting of the story. Nothing wrong here.
Character: 8/10
I mentioned this previously, but there's very little character development save for 3 or 4 characters, and the other 17 or so are just basically ignored. It was strange because for the 3 or 4 that they developed, they did it extremely well and I found myself becoming pretty attached to the main characters, but the scenes with the minor characters just felt too filler-like because of how brief and undeveloped they were. It was almost like the producers were just looking for excuses to kill off the characters. But you won't be disappointed by the two main characters as you watch each one's love for another shatter from their clan clash and how they struggle between their love for each other and their duties to their families.
Enjoyment:7/10
The pacing kind of ruined the enjoyment for me, as well as the episodes where all you see is a bunch of minor characters get killed off for no reason. But the anime does pick up near the end however, since most of the characters are dead at that point which left a lot of room for story and character development, so I think the last 5 or so episodes were extremely well done.
Overall: 7/10
I understand a lot of the complaints I had were not the fault of the producers since they had to stick to the manga, but there definitely were some small things that they could have fixed which would have had a major impact. There really was a lot of potential for this anime, but I definitely wouldn't say they did a bad job. If you're looking for action and a dark story, give Basilisk a watch, but don't hope for too much in complex character development or plot twists.
