I think this page is hinting the North Sixth research on her is exploiting something not in standard pet yu education (like aggression to other yukkuri) as well as having increased skin durability and mental training and regeneration.
So instead of having self regeneration she's been trained to obtain body parts which is painful until it is accepted by the body (immune system rejection).
The previous chapter mentioned that 890 had some kind of mutation in her, so maybe that's what it is -- her capacity to acquire other accessories and parts.
it couldn't be pulled out and for three days and three nights it hurts a lot.how it enteredif spoken in the cases where restraint are exhibited.Well for example, the secret researches origin are conductedRecently the pet yu education, even the reverse are used. But that strangeness is corporate secret so I don't know.
*the things pets are taught not to do are being exploited by companies (?)Make it our punch slave noze!Yuaan? A strange accessory yukkuri is here noze!!Yukkuri mentality obstruction are, yukkuritis, tarinai yu(not enough), raper transform, and other kind similar to human version also exist.It's not happy, clip and cloth, things can be put in the makeshift bag which is a good thing.Near the end of town I begin my preparation.Bag, hat, hiding bush, alice's hairband, ribbon, the hat type accessory is heavy, mirror is put in too, and certain amount of protection gear are there too.