YMMV / 91 Days

• Awesome Music: TK from Ling Toshite Sigure (Psycho-Pass, Tokyo Ghoul) is back at it again with the anime opening "Signal."
• Complete Monster: Fango is the homicidal enforcer of the Orco Family who introduces himself by beating Tigre to near-death, then causing a shootout in a bar. Later, Fango has a teenage boy named Tronco killed and shoots right through a prostitute to kill Avilio Bruno, who was hired to kill him. When Don Orco refuses to declare war on the Vanettis for putting a hit on him, Fango stabs one of Orco's men named Corvo with a fork in the hand and works with Avilio and Nero to overthrow Orco, ending with him killing Orco and feeding him to his men. Taking over Orco's crime syndicate, Fango starts a gang war which kills countless people, and nearly kills the wife and daughter of prohibition agent Delphy to force him to back down, after he secretly gave him the info about Vanetti Family's secret distillery called The Lodge. Fango also forces Corteo to make his booze for him only to sell Corteo out to be killed by Vanettis after Fango got Corteo's recipe from a greedy prohibition agent he killed; Fango also intends to betray the Vanettis by attempting to kill Nero.
• Cliché Storm: The show is full of revenge cliches, especially in the second half when Avilio begins to set the mafia families against each other.
• Estrogen Brigade: Obviously, as this is a show with a male-dominated cast and a Troubled, but Cute Bishōnen as the protagonist.
• Ho Yay: All the women/girls in the show are either in a relationship with a side character or related to one of the main characters. As a result, the story is driven by the relationships between the male cast members, whether positive, negative or ambiguous.
  • Avilio/Angelo and Corteo have been "best friends as close as brothers" since childhood. Episode ten, where the two practically run away together, is especially strong on the Ho Yay front.
  • Avilio/Angelo and Nero, particularly during their little road trip in episode four. Nero's willingness to trust Avilio above his own right hand man and both Avilio and Nero's ambiguous words and actions in the finale only adds to it.
  • You could almost be forgiven for mistaking the dynamic between Avilio/Angelo, Corteo and Nero as a Love Triangle with Avilio at the centre. Corteo's Green-Eyed Monster moments over Avilio's association with Nero doesn't help matters.
• Narm: Half of the scenes in which Fango demonstrates his insanity can look very narmy. The effect is only strengthened by his ridiculous costume and feminine hairstyle.
• The Scrappy: Frate Vanetti. While he's by no means the most evil character in the story, many viewers hate him due the ease with which he attempted to sacrifice his older brother out of a desire to avenge his personal grievances.
• So Okay, It's Average: Although nobody will tell you that this show was bad or weak, very few people remembered it after it finished airing.
• Superlative Dubbing: Funimation just seems to have a knack for nailing prohibition-era lingo and lilting Italian-American accents. Like Baccano! before it, the dub has been acclaimed both for its authenticity to the period and a solid, natural performance from a cast made up of mostly lesser-known actors, with only a few big names (like J. Michael Tatum) thrown in the mix.
• They Wasted a Perfectly Good Character: Gabriella Ekens, writing for Anime News Network, thinks the show leans a little too obliquely in its character writing, particularly with Nero: "While I get Avilio not spilling his soul easily, Nero is a big boisterous guy who's supposed to be too friendly, and the final gut punch relies on our knowledge of his psyche. Unfortunately, I don't know much about him besides “puppy man who doesn't appear particularly troubled by the moral compromises of his lifestyle.” It would've helped a lot if he had expressed some reservations or made excuses for his actions – just something to indicate that there's a conflicted moral agent in there, not just someone who's totally alright with anything so long as it benefits his family."
• The Woobie: It's hard not to empathize with Fio after everything she's had to endure, especially when she ends up all alone and morally broken, pregnant with the child of a man she did not love and whom she was forced to kill for the sake of her older brother.