Fushigi no Umi no Nadia, Shin Kaitei Gunkan Recommendations

Fushigi no Umi no Nadia
If you liked
Fushigi no Umi no Nadia
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Shin Kaitei Gunkan
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Shin Kaitei Gunkan
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Similar stories involving advanced civilizations and technology, fought mostly in open water or by using submarines. There's also doomsday devices and plots of betraying one's own kind.
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