The maturity, tone, and execution of the fast-driven plot has really peaked my interest for this anime. At the time of writing this review, I have watched up to episode six so far, and have been excitedly waiting for every new release of this episode. In fact, I have also re-watched all the previous episodes at least once to see any little foreshadowing of the plot that I may have missed the first time around.
This is genuinely the kind of anime that I missed and yearned for the most. Adult-oriented, dark, with a rich plot. It seems that lately, there has been an over-abundance of animes that are slice-of-life, moe, and quite frankly, fan-service. If you want an enriching story that gets you to the edge of your seat for pretty much every episode, you need to see this. The amount of clever betrayals (and "false-betrayals") in just the first six episodes alone is astounding (you will not be disappointed in episodes 2 and 6 in particular).
What binds me most to this anime is that, despite the fact we know beforehand that "this is a revenge story" (reminiscent to The Count of Monte Cristo), the execution of this revenge is still unexpected and makes this anime a rollercoaster of a ride.
My only gripe about this anime would be the fact that the main character, Avilio/Angelo Lagusa, does not have much character, especially in contrast to Fango, a wildcard character who is crazy (actually crazy though? or madman theory? - referencing episode 5). However, I've seen other similar unemotional characters in plot-rich anime before, and the plot usually vastly compensates for this one gripe. Not to mention that his lack of character and emotions does make sense in context with what happened to him and his family in the anime (minor spoiler for episode 1).
Unfortunately, I cannot continue more analysis of this anime without giving away major spoilers, but I could definitely talk more about the nice references they have to Christianity, the Bible, the Goliath, The Waste Land, The Godfather, et cetera - but alas, I cannot. I definitely hope though that by writing this review, you, as a reader, can become convinced that this is definitely one of *the* animes this season. I highly recommend people (who are of mature age) to it.