Some years ago I made a thread that the universe of Naruto it exist actually in our time for ex. 2015, there is a technology like ours but they just dont use it because they are shinobi's. (Maybe its like tradition) Remember that everytime they talk about saving the world they always say ''The shinobi world''. In the last panel of the last Naruto chapter we can see a city behind it...
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... So that hit me. Here is my theory thread
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