Tanya la Britannia, 89th in line to the Holy Britannian throne, is thrust into a royal court where power is survival, and survival is war. In a world of Geass powers, political conspiracies, and revolutionary forces, Being X may have finally trapped her in a game she cannot win. But if victory demands a devil… then Britannia shall have one.

Tanya dies in an artillery barrage on the Rhine Front, contrary to both her and Being X's plans. Unwilling to let his chew toy escape so easily, Being X reincarnates Tanya back into Japan... Six years before Britannia conquers Area 11. (First posted on Space Battles)

Killed on the battlefield, Tanya is given one last chance by being thrown into a world where the power of the king is absolute.

Tanya died and she didn't expected to reincarnate for a third time with her memories intact. She also didn't think she'd be given a better starting point as a Britannian Princess. Her belief that she would have an easier life as royalty was soon dashed by the political intrigue of the Britannian Royal Family. And she also has a younger brother and sister to look after!

Canonical sidestories attached to A Young Girl's Guerrilla War

IMPORTANT: These and all my works here are all posted as one single Work at AO3, i am just Putting them here as their exact Xovers. This one: Kaiserin's Many fates version of A Young Girl's Guerrilla War, AU esque. Omake content level writting at most, you have been warned OG author of A Young Girl's Guerilla War is Redhead in SB and AO3