NA Localization:
In a faraway land, the Demon King's sword burns with destructive flame even today.
Although Nobunaga possessed many swords, not one saw any use once Nobunaga was reborn as the Demon King, replaced instead by an aberrant demon sword. Just like Demon King Nobunaga, it is a collection of various possibilities of Nobunagas. This sword is also an amalgam of all blades possessed by Nobunaga.
It's said that the sword continues to burn in oblivion, still waiting for the Demon King's return, standing upright for eternity.
"Its name? Brace yourselves! Since it's a demonic sword that burns all to ash in the hands of the Demon King...it's called the 'Demon King Sword!'"
...Uh-oh, the sword fell over.
Fan Translation:
The sword of the Demon King, even now, continues to burn the world away in a far-off land.
While Nobunaga possessed many swords, the sword that the Nobunaga who transformed into a Demon King held was this grotesque looking sword, different from all. Just like the Demon King Nobunaga that is the collection of all possibilities of Nobunaga, this sword is also the collection of all the swords that Nobunaga owned.
It is said that the sword, which still burns at the nil-aeons land, would keep standing until its exhausted moment, waiting for the Demon King's return.
"Name? I wouldn't blame you if you are surprised, the cursed sword that was dusted by the Demon King themselves, that is named "The Demon King Sword"!"
...Ah, the sword fell down.