Meeting her

Assassin is a ninja duelist who was trained to assassinate the top duelist of the world. This includes Yugi Moto, Yusei Fudo, and Yuma Tsukumo. Yugi and Yami have their own bodies in this fanfiction. (Sorry if the characters are a little too OOC. It's not intentional.) What happens when their world gets a little twist from a Grail War that has been happening for the past 300 and what happens when the duelists get involved? Is Assassin all that she seems to be? Who will they meet and what will they learn from this Grail War? *pst.........click the button that says read.......
Thank you* All rights reserved to the creation of YuGiOh and Fate/ Zero. My OC is MY OC and this plot is MINE. Enjoy the story and thank you for reading.