Mc is reborn as an experiment. She is given a number as a name and is trained as a human weapon. Later on the experiment ends and she and another boy is left ( think mc’s name was five or something). Later on she joins an army and becomes well know for her skill. The boy from before Is either part of enemy or higher rank than her in same army ( tho I think he is enemy). I have only read up until that point. There has been no romance up until this point. Any help is appreciated!