Aiki-doh-ki

Not the lost hojo Masamune, the Hattori Hanzo, or a katana for that matter, but it has the same writing on the blade as the one "The MaskedBoi" posted on January 13, 2019. Google Lens brought me to Zsolt's post from July 17, 2021, on page 6 of this forum. It leads me to believe that someone is using this mark specifically. I also found the sword in an antique shop and did not pay much money for it. I only bought it because it's really odd. It has a short blade and a longer handle than you typically see. I don't have measurements handy, but I can post them with more pictures if interested. The tsuka and saya are made of metal, possibly brass. I've been asking around and nobody I know seems to know what kind of sword this is. Someone did say that he thought it was part of a Chinese two-sword set. I did find a Goole image of what appeared to be the opposite hand sword of this one but when I clicked on it the site was no longer available. I apologize for reviving this old thread, but I thought it was relevant to the AI discussion portion. Regards, Nick