>>282950771
I was under the impression that it was supposed to be scary and he just didn't do a good job of it. He went through the trouble of explaining her actions scientifically so I don't think it was supposed to be a joke and a lot of her expressions had a horror vibe to them. But it's not consistent and she talks way too much for it to work.
I think the art style in this manga also just doesn't lend well to horror even though Axeman has done it well in past works. There are a couple times I'm pretty sure Yor was meant to look deranged but she just looks mad.