So I was thinking of a manga story.
The story" this girl was born with an assassin father and an assassin mother. Her father died with an unknown illness and died in front of her. That's when she saw Death or people call him, the Grim Reaper. She didn't told anyone since they would think it's just a story. When her mother was going out to assassinate people, her mother was murdered by a gang a week later She later made a deal with Death. The deal was that she would assassinate the people that murdered her mother and at night, her body would turn into Death and take the souls of the dead ones she assassinate. Months later when she was in the gang's house, w she was in Death form, she saw a spirit or ghost. That ghost didn't know who he is and how he died. Later on she found out why her mother was killed. The reason why is because when her mother was trying to assassinate the boss of the gang because someone hired her to, she accidently shot his son. That son was the ghost.