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yo so oni=demon and moon is "tsuki" blade= ...idk but i hope this helped:)
demon blade in Japanese is akuma no tsubasa
Demon = "Oni" or "Youkai" + Blade = "Katana" or "Ken"
oni
it means demon so like kama katana means demon blade
"Oni" (pronounced: oh-nee).
hi no akuma
Demon means Oni in Japanese also mean folklore.
probaly Kyuubi reference from naruto newtest3
悪魔とボクサー Akuma to bokusā
13-Bi tora oni
悪夢の鬼 Akumu no oni