The Grimoire's Twin and The Forgotten Weapon

A/n: I do not own RWBY, Nier, or any of the photos used, but the Plot of this story.

Taking place in an Alternative Universe based on Nier Replicant, You are (Y/n) Shiro (L/n), a Hamelin Organization Soldier and the last living member of the 13th Crusades Unit who has deserted and has gone hiding after watching your Twin Brother, Weiss, getting turned into a Grimoire before your own eyes. Like your friends Emil and Halua, You are the Ultimate Weapon created by magical experimentation, given the name Experimental Weapon No. 0 by The National Weapons Laboratory of Japan.

But in your case, You were molded into a Weapon by combining the best attributes of the Legion and The Red Eye into your DNA to create the Ideal Human Soldier at the Cost of your Mortality. But, None of that mattered anymore as you're trying to survive in this doomed world while making a home for yourself in the Cold-War-Era Classified bunkers of an abandoned military base in Greenland for about ten years with the help of a Mysterious Android: Accord. Until one day, as you were subjugating the remaining Legion, You ran into four girls who were oddly yet understandably unfamiliar with the world and their situation, especially a certain girl with cat ears.

Will You Trust and open your heart to them, or will you kill them just like the amount of Legion among the millions of infected that you've already killed during your time hiding away? But honestly, you wouldn't be so sure...