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When Nara Shikako sent a version of herself to every dimension in which she was absent, she understood that the chance of her being the one to make it home was so astronomically small as not to exist. This fact doesn't mean that she expected to come to exist in Sunnydale, California.
Sunnydale, a small California town filled with demons and monsters, is set over a dimensional gate to the Realms Infernal. Guarded and protected by a teenage girl blessed by the powers of not good to prevent the world from ending early, lest all life on earth end before the properly scheduled apocalypse.
Yes, a world where the forces of Not Bad and Evil fight over the scheduling of the end of days through their mortal champions or something. Shikako never watched much Buffy in her last life, err, first life? She never watched much of the show, so she just knows the basics: that all kinds of demons exist, that gods meddle, that the local magic is inherently corruptive, and that the hero, a teenage girl, is more concerned with her social life than with the lives of the citizenry.
Shikako will have to think about this. Sure, gods can be sealed or trapped, just look at the Shinigami the Uzumaki bound to a mask, the Rabbit Goddess sealed in the moon, and Gelel sealed under the earth.
Shikako knows how, in theory, to seal gods, but putting that theory into practice is another matter entirely, and she doesn't trust her luck not to require that knowledge.
What to do? What to do?
If she is going to build a life here, she will need an identity, which means finding the local fixer. There is a Bar that serves demons, and in Los Angeles, there is a demonic law firm called Wolf, Ram, and Heart.
If she is going to go to a fixer, she needs a cover. Do Ninja, Samurai, and those who live in her world even count as human? The Sage gave her world the Elemental Nations chakra, chakra systems, and the ability to manipulate it. Most clans have bred with strange creatures, spirits, and possibly gods for bloodlines and powers.
Shikako is a Nara. Could she pass as a shadow creature of some kind who just arrived on this plane and requires an identity? It's even true.
Having a plan, Shikako gets to work.
Giles stares at the creature, which appears to be a short Japanese woman dressed as a traditional shrine maiden. He knows it isn't human; it moves too fluidly, makes no noise as it passes, and even the grass it steps on isn't disturbed.
“And what might your name be?”
He asks it wearily.
“You can call me Shikako Nara.”
Giles stares at it for a moment. Dear girl, really, as an alias, it couldn't be more obvious.
“And what are you doing here, Shikako Nara?”
He asks it.
“I am no Seal Master, but I am a journeyman; as such, I must journey to perfect my craft. Sealing ancient evils under shrines has been the traditional way of things for time immemorial.”
Giles processes that and concludes that if it wanted to seal away evils, it couldn't have found a better place than a Hellmouth.
“Do you think the Mayor, an ancient sorcerer planning his ascension, would sell me the high school? I would so love to seal the Hellmouth.”
The creature in the shape of a Japanese shrine maiden asks him, sending Giles into a panic.
Within two weeks of Shikako taking up residence in Sunnydale, the local High School suffers a gas leak and is destroyed.
Ram Wolf and Heart quickly offer to buy the land the ruined school sits on while trading a suspiciously ready school complex to the city, securing total ownership of the land that Sunneydale High School once occupied for their anonymous client.
Shikako Nara, now the owner of one interdimensional hellgate, quickly goes about her business, creating a traditional Japanese temple.
Shikako doesn't trust any of the local gods, so she dedicates the temple to Gelel just to be sure that there isn't any funny business.
If a rich young eccentric Japanese shrine maiden wants to buy a high school and build a temple to a Kami no one has ever heard of before, who is going to stop her?
Once Shikako has the massive shrine set up over where the Sunnydale library used to be and appropriate Torii gates set up, she moves on to the fuinjutsu necessary to both keep evil creatures out and contain the negative extra-dimensional energies before converting them into something less hostile.
Turning chaotic negative energy into Stable positive energy was a difficult task, but Shikako already has experience with manipulating three energy types.
What she ends up with is an energy that has a decidedly anti-undead or demonic bent; it might not exactly be divine or created by faith, but it sure works at keeping the vampires out.
It also slowly roasted the elderly vampire in the basement to ash.
Now that the temple complex was built at an alarming speed, along with the wards to keep out the undead while converting negative energy to positive, Shikako got to work on her next task. Vaults.
The show had what seemed like an endless stream of world-ending MacGuffins and unkillable creatures, and if she can’t figure out how to destroy them, then sealing them in her temple's vaults is the best option available.
A vampire with a soul who will become a monster if he experiences happiness? Well, it's a good thing Shikako already knows how to seal souls. It's due to her experience that sealing Angel’s soul in his body until his body's destruction is a simple enough matter.
Shikako has been in this town for a few years now and has collected many weird creatures, sealing them in teapots.
If Suna can seal Shukaku in the teapot, why can’t Shikako seal the endless stream of strange spirits and otherworldly creatures in them before stuffing them in her impenetrable vault?
Shikako has also had to deal with the mercenaries that she thinks the Watchers' Council keeps sending her way. Apparently, they think she is the priestess or avatar of some unknowable void god or something.
Poor Gelel, he's so misunderstood.
Outside of playing with the Slayer, gaslighting the Watchers Council about what she is, and sealing everything she comes across in teapots, Shikako has also found a man named Ben, who was possessed by a hell goddess named Glorificus. Shikako wastes no time in turning Ben into a jinchuriki.
A hell goddess, that’s a lot simpler than an Eldridge goddess from beyond the stars set on eating all life on the planet.