Assassins Should be Adorable

An aging assassin is plucked from earth by a vengeful god, stripped of all but a few memories, and sent on a mission to kill one of its enemies on the mortal plane. Something goes wrong however, the soul is bifurcated and ends up the unwilling head mate of the body they are implanted into. When disaster strikes and the young girl and her incomplete mentor must make their own way in the world despite the dangers, armed with little but their wits, a few scraps of otherworldly knowledge and all the lyrics from the sound of music -for some reason- they must make tough choices and cruel risks to survive. (This actually originated as a BTDEM fan fic -which I never write- but i found I didn't like the restrictions that playing around in somebody else's world comes with. I hope I've dome more than enough to differentiate the worlds but even so you may notice some similarities in places.)