 If you liked
Gate: Jieitai Kanochi nite, Kaku Tatakaeri
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 ...then you might like
Nihonkoku Shoukan
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The Japanese Self Defence Force fighting against a medieval fantasy world whilst diplomats scheme behind the scenes. This is something which can be found in both series. With both series being Isekai they also are both heavy on the world building, especially when introducing the governments of the other world.
So if you like seeing the JSDF overpower some medieval warriors all the while learning the world though diplomatic conversations you will definitely like the other manga.
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Recommended by ThatDutchOtaku