doesn't use a sword, uses wires

The ridiculously huge katana was nothing but a decoration.
It was not surprising that he had been unable to see the instant she drew the sword.
Kanzaki had never actually drawn it. She had only moved the sword slightly within the
scabbard and then moved it back. That motion had been to hide the hand manipulating
the seven wires.
Kamijou’s hand was relatively unharmed because Kanzaki had loosened the wires just
before they severed his fingers.

- Toaru Majutsu no Index Volume 1, Chapter 2 Part 3