Talk:.flow/theories/@comment-174.24.11.42-20170714071634

My interpretation: Sabitsuki was born with a deficient immune system (possibly HIV+) and had to be installed with cybernetic organs as a result of a disease soon after birth (hence the "machine" effect). She was born around the time of the first outbreak of the Rust illness, which killed many children at the hospital she was in. However, she herself survived due to her isolation (as seen with Little Sabitsuki in the Parade ward, located in her own seperate room before the erosion meter increases). When she uses the computer, she uses an experimental form of virtual reality intended to be used for psycholgical therapy based off her own thought patterns, made possible by the fact she is a cyborg. Even though she had been previously employed as a beta tester for this technology before she contracted the "Rust" illness (which she was more susceptible to due to her weak immune system), after her diagnosis her mental world rapidly changed as the knowledge of her illness mentally consumed her. She continued to test the system as her wages rose due to the special insight gained from her case and in order to incentivise her to continue testing in spite of the mental stress, but being placed under quarantine, she was unable to do much with it.

Oreko was a childhood friend who she met as a result of her being the daughter of a scientist her parents met specializing in cybernetic enhancements. She grew up around her father's machines, hence why she is often seen with them.

Sabitsuki becoming Rust represents her entering the terminal stage of her illness, with the ending depicting a maid/nurse, assigned to her apartment block to care for her wearing a mask (as presumably the disease is airbourne - the same way that oxygen rusts metals), before "euthanizing" her with a chainsaw (possibly meaning the disease cannot be stopped by bullets). The rust corridor represents the disease killing Sabitsuki off, with the smile that appears when she encounters the nurse being the disease beginning to physically manifest itself.

So, nothing really new other than the cyborg thing…