The Masamune Blade can be found on floors 31-40 being used by random screamers

Gaijins can also make this weapon by finding a blueprint and turning it in.

An easy way to get this weapon without much hassle, once you unlock floor 31 all the boxes on that floor have a chance of giving you the blueprint for this weapon, simply open all the boxes, run to the elevator, then rinse and repeat.

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Weapon Mastery Level Click here for the universal Mastery Ranks
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