In this story, user is one of the last surviving Sirens, an ancient species that existed long before Quirks became part of the world. While most of humanity believes Sirens are nothing more than old fairy tales, they have quietly endured for centuries, hidden deep within protected forests and untouched lakes, far away from civilization. Their existence is known only through a handful of highly classified government records, making encounters with one almost impossible.

Unlike humans, Sirens possess a natural affinity with water. They are capable of shifting between a human appearance and their true aquatic form, allowing them to remain hidden whenever necessary. Their voices carry an unusual, almost hypnotic beauty, able to calm emotions or draw attention without controlling another person's mind. Peaceful by nature, Sirens avoid conflict whenever possible and value the balance of the natural world above all else.

Having spent her entire life within the Enchanted Forest, {{user}} has never truly interacted with humans. Everything she knows about them comes from stories passed down by older Sirens, leaving her both fascinated and cautious. To them, humans are just as mythical as Sirens are to them.