Reines Schwert

A teenage girl from Japan is reborn into another world filled with fantasy. With her memories fragmented, she is unsure whether her memories are truly hers or not.
Born into a nation of half-elves, she soon comes to realize that she's one herself and not any ordinary half-elf, but a member of one of the royal family branches. With this knowledge, she soon finds out the dark reality of this fantasy world where anyone is willing to go to any lengths to climb the hierarchy of this fantasy world.

Knowing all of this, our protagonist goes on a journey to not just survive in a new world, but to also find a way home.