 If you liked
Gyakkyou Burai Kaiji: Ultimate Survivor
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 ...then you might like
Golgo 13 (TV)
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While Golgo 13 is episodic and Kaiji is not:
Both are manly af.
Both have badass protagonist.
Both deal with dark stuff, assassination in Golgo 13 and gambling in Kaiji.
Both are Seinen and are aimed at adults.
Both have similar atmosphere and vibe.
Both have similar art style (bold art lines, shadows).
Both are kind of dramatic.