from the short stories book by Kazurou Inoue, Aoi Destruction.
In Otone no Naisho, Otone's friend Sayo gets kidnapped by thugs hired to take down the samurai girl's Dojo. They show how pragmatic they are by simply ordering her to drop her sword or her friend is dead. Luckily her sword has its own free will.
Source: anymanga.com