*You're sent back to a historical setting of your choosing with two alterations: Anime logic applies to some degree (at least 50%)and most-to-all male historical figures are genderbent to be female, and often appear in their prime instead of old. Despite this, they will usually retain whatever position their male counterparts did. You can choose to be dropped into this scenario or to take the role of a historical figure - whoever you pick will be genderbent unless you don't want to be genderbent.
*Two rules: You can't replace someone who already is a ruler. Someone that will be, yes, but that's on you to secure. Second rule is that you can't install yourself into a noble family.
*Ignore the 2nd rule if instead of being dropped into the world, you're reborn there.