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This article is about a/an false organization in Kamen Rider Fourze.

The OSTO Legacy (オスト・レガシー Osuto Regashī) was said to be an organization formed from the remnants of the OSTO, that protects the Space from evil threats which appear in Kamen Rider Fourze the Movie: Everyone, Space Is Here!.

It was then later revealed that it was just a front for the Space Ironmen, who used OSTO's name to get to Kengo and the Kamen Rider Club to help them infiltrate XVII.

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