Namae no nai Kaibutsu - Kumo to Shoujo to Ryoki Satsujin - Vol. 3 Ch. 13

[SuplexSensei]

Yuko's death and backstory is clearer now, with some holes left like how such killer spiders exist?

P.S. A little peek at her midsection right before seeing her suffer from being torn to shreds right from there.. that hits way too close to my type of ryona.... and no, don't put me on a stake. TvT

 

[redscizor]

In my opinion, she has supernatural power,
1) She can control inferior animal, like insects, then she can translate her awareness at a spider
2) Yes, spiders attacked, but she transfered her awareness at a spider ... maybe she ate her former body, too
3) Because her supernatural ability, she can create illusion about her body, there isnt evidence that her human body is real, and we know what her uniform was ragged when she was attacked and the spider girl uniform is complete
4) Because 1, she can summon and control small spiders, she was learning that control few chapters ago

By the story, i am hard, stupid japanese!!!

This backstory is better that "Transforming via App - What about an Arachne?" Logic xD