If only things were different

Once upon a time, there was a siren, a creature of the sea, whose life was pure and untainted, free from the weight of the world.
But then she starts to notice plastic in the ocean brought by the waves, thrown by careless humans, endangering her habitat and the people around her.
She soon realized the gravity of the situation as her habitat and friends were dying, and she was left all alone.
Expressing Her Heartbreak:
Feeling lost and unsure, she was left heartbroken and didn't know what to do next.
Looking for revenge, she starts killing people; just like the legends, a siren.