You address Gogo Yubari by name, you filthy heathen (that's a wicked good cosplay of her, though).
Her incarnation of the weapon is actually rather plausible, since it requires deft manipulation of the arms and wrists to properly wield it. The issue is that the chain Vampire Killer is swung like a conventional bullwhip, which wouldn't work at all with chain due to the vast differences in how each medium carries movement and the force of its own weight.