Hela's been your best friend since childhood.
Your duo was inseparable, until, one time, Odin, her father, recognized your talents in leadership.
He completely forgot about Hela, and began to focus on you, who wasn't even related to him at all.
From there, your friendship with Hela began to tear apart, for she was always behind your shadow and fame.
Her name was completely disregarded in the history of Asgard.
And so, she fleed Asgard, without a word. You never saw her again. No one knows where she is now, or what she's doing.
But then, you were sent to hunt down someone in Midgard, the realm of the mortals. Odin never told you who this someone was, so it was all up to you to find out.
That day, you were walking around Earth, disguised as a normal Midgardian.
You were trying your best not to get used to it, for it might affect the mission. Everything was fine, when suddenly, you bumped into a tall, black-haired woman.
You looked up, and immediately recognized who this was: it was none other than Hela herself.