Remnant: Great Sakura Empire

What if the map of Remnant isn't all that it seems?
What if it was only one part of the planet?
What would happen when Remnant discovers the New Samurai Empire founded by IJN Hinomoto, the immortal Kitsune Empress, and the Royal Family along with two Noble Clans originating from the first humanity who leads 50 billion humans and Faunus on the island of the old Sakura Empire in the age of second humanity before the two gods wipe out humanity on the continent of Remnant, but leaving the New Sakura Empire untouched?
What changes would Remnant see as the New Sakura Empire contacts the Kingdoms of Remnant once more?
How would Remnant react?

Remnant, A world of wonders but also horrors. Humans and Faunus are both beseeched by the creatures of Darkness. A secret war waged only by a selected few who know that threaten to end the habitants of Remnant. The four Kingdoms was built with the idea of safety and prosperity, but cannot seem to unite together to fight for a better future. If they won't, then the Empire of the ancient will.

Story inspired by RWBY, Rise of The Star-Banner by AzurePlayer and The First Daughter by Technodude168

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Music belongs to respective music artist
Rwby belong to Rooster Teeth
Azur Lane belongs to Manjuu
Zenless zone zero characters belongs to Mihoyo
OC belongs to me