 If you liked
Daimajuu Gekitou: Hagane no Oni
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 ...then you might like
Genocyber
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"Genocyber" and "Demon of Steel: Battle of the Great Demon Beasts" / "Daimajuu Gekitou: Hagane no Oni" are mature sci-fi anime that involve powerful monstrosities destroying humanity. The violent action scenes of these two works both involve modern militaries and create similar atmospheres of terror.