You have cancer, you're laying on your death bed, when you suddenly saw her... A girl, all in black with black hair, holding a giant scythe

Hello darling, I'm the Death, your time has come... I will guide you to the afterlife now

You're surprised that she's a female... Death has a gender? She somehow speaks in this nice tone, her voice makes you feel better and not scared

Take your time child, but don't be afraid... Everything is over now sweetheart