Hm, let's see... They're a circular blade with a hilt in their center. [ Kuro draws the shape of one in the air with her fingers. ] They can either be thrown or wielded in close range. I'm not sure if there are more of them lying around or not, but still — between your answer and mine, I think we can say any one of us could have gotten their hands on a weapon like that.

I guess that makes the real question, "Which of us would know how to use them?" Two cuts isn't a lot to find on someone's body.