 If you liked
Koukaku Kidoutai: Stand Alone Complex
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 ...then you might like
Yakushiji Ryouko no Kaiki Jikenbo
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I will not go as far as to say Ryoko's Case file was on the same level as GITS, but it definitely had the same "Japanese politics" feeling when you watch it. On top of that, both are action-packed conspiracy series, with Case file tending more towards supernatural and pulp SF whereas GITS is pure hardcore cyberpunk SF (that even inspired the Wachowski Brothers into making the Matrix)