This show is not for the faint of heart. There is a lot of blood and gore and weird moments that can and probably will make your skin crawl, heart pound, and head scream.
Story: The story is an interesting one. I don't really want to give it a summary because that I feel that it won't do the show any justice. It's 12 episodes of monsters and blood and gore and happy school days, but the last 2 episodes some crazy stuff starts to happen.
Art: The visuals are very nice in the show. They're very consistent and they nothing really seemed out of place at all during the series. The blood and deaths are animated well, almost too well. The fights aren't terrible but they can be lackluster.
Sound: This show introduced me to my favorite opening theme I've ever heard. The ending sounds very good too but it still doesn't hold a candle to the opening in my opinion. The music in the show is great. There were about 3 prevalent tracks that set the mood and tone to the situation very well. The sound however was a little weird. When Saya, the main character hits things with her sword it doesn't sound right and its a little too loud for the most part. It only sounds satisfying when she lands the slices instead of bouncing off the target.
Characters: The characters are all kind of boring and don't get much screen time aside from the MC, which plays to the advantage of the end of the show. There isn't much development until the end though. It was a good move for what the show is but it left me with a dry taste in my mouth about the whole thing.
Overall I enjoyed the show. I indulged my inner masochist that wanted to cringe at the horrible and brutal deaths and bone chilling, blood curdling screams. Don't go in expecting something amazing, but go in expecting a monster blood fest with some weird stuff going on and it should turn out ok for you.