forbidden love

a guardian angel assigned to protect someone and a devil assigned to kill that person they first meet. nash dragneel a devil bad boy is sent to earth to kill someone. sylvia fullbuster a guardian angel who successfully completes every mission and a good girl she can go to drastic measures if it involves her friends and family two completely different paths will cross paths and a new evil is coming for one of them. what will happen? how far will they both go for each other? will love happen or will destiny intervene?