Alyssa is controlled by Satan. Satan doesn't control Alyssa physically, but mentally. She isn't a robot, but she lives on souls.
When she meets a guy one day who isn't into her looks, in the beginning he was just a target and she was just a stranger. Now, now he's something more and she's the one with a beautiful personality. When Alyssa is asked to take the target's soul in the minimum of two weeks, she's stuck between doing the job or loving the man.
Alyssa is a The Soul Bandit.