Three Months

Aurelia and Brian, whom were madly in love throughout the entire duration of highschool, have to face a sudden split when her father is forcing her to move states and leave everyone behind to fulfill her secret job as a hit woman.
Four years down the line and many kills later, her new target is the head of a ring that is in deep rivalry with her own. She has three months to take him out.
What's it say, when this very target, is none other than Brian himself?