Despite only being 12 episodes long (standard length of roughly 25 minutes each), I really liked the plot. Sure, it didn't seem like much in the synopsis at first (however the synopsis did allude to a plot twist), but once I had starting watching, I just wasn't able to stop. Truth to be told, I finished watching everything in one night (....well, by the last episode, it was already 3am in the morning...). As both a unique and engaging plot, its successful delivery lies within how it maintains a deep and serious nature without creating the suffocating, emotionally burdening atmosphere.
Whilst a number of questions were left unanswered due to the last 3 episodes being quite fast paced, I did quite enjoy watching this series and its characters.
My favourite character would have to be Tenka Kumo; hairstyle aside, I liked his dependable character, and whilst many would argue otherwise, his subtle character development as the series progressed towards its climax.