When I chained him 29 times, Bombshell gave 2 Yagyu Darkblades. Guess I was lucky. I also used Masamune. So, it took me almost 3 hours to kill that @#$ (level 99 + 2YD + Masamune).

And I had to flee a couple of times. He really is an ass when his HP is below 5 million. Loads of hits (sometimes, until you die), each dealing over 4000 of damage. So no, I don't think you can beat him the way you want to. Not yet.