I really enjoyed the narrator. She pulls off the bored defeated tone as well as excited and sarcastic. I know some narrators can be overly enthusiastic, but she handled it perfectly. She also manages to sound young and believable as the main character. 
 The story, on the other hand, impressed me a little less. I think it would have been better without the love triangle. The plot doesn't have anything particularly new. The main character going from weak to powerful is a common trope in YA (and especially anime), but I like it. The story was face paced and has some action in it, though admittedly I've read better action scenes. 
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