I'm Nagasone Kotetsu...or a counterfeit of it. The one who forged me wasn't Kotetsu. He was a swordsmith named Minamoto Kiyomaro, also known as Yotsuya Masamune. I was forged by a proper swordsmith, so I perform the best among the counterfeits. Although, my former master seemed to believe that I was the real deal until the very end.... Ah, right, my former master was Kondo Isami.