 If you liked
Tokyo Vice
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 ...then you might like
Urban Square: Kohaku no Tsuigeki
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These 80s OVAs have similar plots: a dying stranger passes on top secret info to the main character, and the main character and his friends/acquaintances (including a detective) get in trouble with a criminal group as they try to protect the info and hand it over to the person the dying stranger instructed them to.