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Fortress Island is the stronghold of the Hyakki Empire. Depending on the media it has a different origin, in the anime it was simply a modified island but in the manga it was originally a spaceship owned by the Andromeda Country.

Functions[]

Fortress Island is able to move freely whether on the surface of the ocean and fly. It holds a massive number of both Oni and Hyakki Beasts.

History[]

Gallery[]

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