 If you liked
91 Days
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 ...then you might like
JoJo no Kimyou na Bouken Part 5: Ougon no Kaze
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While both of these two series differ a lot from each other, they have few things in common that many might find as enough to give either of them a try: main character deciding to join the mafia (from one reason or another) and thus learning more and more about the mafia's structure; dangerous actions happening in the main character's life due to being a member of the mafia; charismatic characters (both main and side ones); emotional moments.