For Everything we cherish (Honkai Impact 3rd X Nikke crossover fic)

(A Honkai Impact 3rd X Nikke: Goddess of Victory fanfic

(I've been dealing with personal issue's so this is me really getting back into it. Also, this story is not connected to my other Honkai-based stories.
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The Honkai. A recurring cataclysm that exists for the sole purpose of exterminating human civilisation.
The Raptures. Fierce mechanical beings of unknown origin that drove humanity to the brink of extinction.
The Valkyries. Powerful female warriors with high resistance to the Honkai who battle it "for everything beautiful in the world."
The Nikkes. Robotic female supersoldiers created by mankind to fight the Raptures as its "Goddesses of Victory.

Two worlds. Two different scourges of humanity. Two different hopes for two different futures of mankind.
What would happen if the denizens of these worlds found themselves in an intertwined dilemma that threatens everyone and everything, and it was all brought about by the squabbles of two ordinary human brothers from another world who became individual heroic symbols in more ways than one by sheer accident?

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I do not own Honkai Impact 3rd, Nikke: Goddess of Victory or anything related to them. I just own any OC's and stuff like that. Honkai Impact 3rd is owned by Hoyoverse, Once known as Mihoyo, while Nikke is owned by Shift up.