Nameless Sword is a weapon in Like A Dragon: Ishin that is also used to craft Ebony Sword, a weapon required to show the Sword Nut.
The Nameless Sword can most reliably be found on Mukurogai from the Arms Dealer for 1000 mon.

To get back to Mukurogai, simply go back the first way you arrived on the island, via the ferryman just to the left of the outside of the Teradaya inn. The journey will cost you 500 mon.
Take the Nameless Sword back to the craftsmith along with all of the other required materials to start building your Ebony Sword and make progress on your Sword Nut substory.
Like A Dragon: Ishin is available on PC, PS4, PS5, Xbox One, and Xbox Series X & S.
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