Karai returns to the source of her power, the place where she first found her amazing sword, the Kira no Ken. With her are Casey Jones, Natsu, and Clyde-all on a mission as dictated by Toshiro himself. But what they find in the dark cave of secrets are things they don't want to confront: their own dark fears manifested in the form of the Teenage Mutant Ninja Turtles! These guys are hard enough to fight in the real world, but think how bad it must be when they are, instead, figments of your own soul and privy to your worst fears and weaknesses!