Douman strike again. So Seigi is a plant and i suposs the one asking her to act like a mediator is the sister. If Setsu restick her head just like that, there is no way she isn't an oddman herself, at this point it's not very subtle she is not a normal human.
@Phantop Setsu have seen worse, at this point getting her head chop off is no big deal.
@Lilliwyt You're right, she did introduce herself last chapter, but it's still seems framed here that Seigi recalled her name once the other 3 started yelling her name out loud.
Heads would've rolled either way...
Yeah, I think it'd be wise for the three to not shout Setsu's name, and instead just grab her and run away as fast as they can. But if that happens then there's no decapitation, so I guess.
Presumably multiple people would be named “Setsu” in this world. It was when one or two of the other girls said something that implied that Seigi were a danger to this Setsu that Seigi would be led to see that she were next to the Setsu whom she sought.
Maybe Helena or Beluna/Berna will show-up with a sewing kit.