The sword is the dragon sword from ninja gaiden, not a regular katana, its in the game along with the hayabusa armour (named after Ryu hayabusa from Ninja Gaiden) because there was a playable spartan in Dead or Alive 4, which is made by team ninja who also made, yes, you guessed it, Ninja Gaiden. So yes it is the Dragon Sword.
All work and no games makes Jack a dull boy.
All work and no games makes... You get the picture.
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