What Anime/Manga Is This?!

Question: youtube.com/watch?v=nPJwSNuTTM8

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Answers: youtube.com/watch?v=nPJwSNuTTM8

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I dont know but im trying to find out! (i only posted here so i'll be able to find you again when i find the name. Ill come back and edit this when i do, unless its been three days..then i'll just try emailing you)
^^ but if you find out before me, would you mind telling me the name?

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