- So it's like Welcome to the NHK: The Darker and Edgier H. P. Lovecraft version?
- This was due to capitalism, consumerism, and the evil in people's hearts.
What Ougai opened was actually a portal into an Infernal's lab where he was working on creating ways to terraform Creation into something suitable for the Reclamation, and drew the immature behemoth-clone of the All-Devouring Depths jouten into the game's Earth. Unfortunately, the Infernal noticed and followed, and decided to turn the planet into a testing ground for the future Saya, inspiring a parental instinct in Ougai and activating Saya's intincts to mimic her original and become a mom ASAP. Since Saya was truly female (unlike true Yozis), she could not impregnate people with Kimbery's colonists, but instinctively knew how to shred the minds of people who saw her through UMI to avoid detection while she sampled biomass (this is why she finds prepared food horrible-without biometrics, it's just DNA, which a being spliced off from another which essentially is a primordial soup, is just plain unneeded). That was, until she met Fuminori.
The reason the brain surgery was "experimental" was that it wasn't technology at all, but a bit of thaumaturgy Saya's Infernal "father" invented to twist Fumiori's (judged an ideal subject due to his ability to remain isolated without setting off too many alarm bells) perceptions to be identical to Kimbery's, who being Kimbery, naturally sees the world without her touch as horrifying and wrong, while Saya is seen as a younger version of Kimbery's human form. Using her naturally divine beauty when viewed as another human and literally being born with an instinctual knowledge of how to use her feminine wiles to find a suitable mate, she seduces Fumiori and quickly turns him into her library on human biology / concubine. Her powers come to advance very quickly afterward, as she learns to Desecrate life forms into Kimbery's ideal (ie, mutant, often amphibious sea life).
Depending on the ending, the experiment fails as the procedure is undone and Saya is forced to relocate, it fails utterly as she ends up being frozen and, not being a spirit, is not able to unfreeze, or is a resounding success as she completes her analysis of the planet's biosphere and develops a terraforming agent that quickly transforms the world into Kimbery's idea of paradise-a watery world of tentacled coral reefs, warped Kaiju, and glass cities overlooking green-blue bays filled with monsters. After Ryoko dies, the Infernal sends a colony fleet of demons to assimilate the reborn world into a new empire, and collect data to be used on Creation.
This makes it even more Nightmare Fuel, because Desecration effects don't warp minds. Which means that Saya's victims are still fully human, mentally, even though their bodies resemble something out of the Mariana Trench. Then their Great Mother's direct lieutenants arrive to collect in full the debt they acquired from the "miraculous gift" they were loaned.
- Alternately, the creature we see in the game is a familiar created by a Witch named Saya. With around the same level of karmic destiny that generated Ultimate Gretchen, but without the wish that negated its existence, the Witch has already absorbed all of her home Universe into her barrier and has sent familiars into other Universes to take them out like a chain of dominoes. Dr. Ougai was effectively "kissed" by the familiar through the boundary between our Universe and Inter-Universal space, which encouraged him to open a gateway to let it in. The familiar just has to kill enough people to fully mature into another instance of the original Saya. After that, it can use the genetic information that it's gathered to expand its barrier across the new Universe, and to send out more copies of itself into others. Fuminori sees the Magical Girl who would later go on to become the original Saya when he looks at her.