Ren is a criminal mastermind. Only nineteen years old, she's near the top of an international crime ring. Her specialty? Murder. There's no room for dwelling on emotions in this job. Only one problem, she meets her new partner in crime, a small, eighteen year old girl, fresh out of training and seems to have a heart too big for the kind of work she's in. Compelled to protect the girl and save her from getting killed or caught, Ren finds out that maybe emotions aren't so bad after all.