Violet Impact, One punch man x female oc

She doesn't remember her family.
She doesn't remember her name.

All Nyx remembers is the laboratory.

Raised behind white walls as an experiment, Nyx spent her childhood as a number instead of a person-trained, tested, and shaped into a weapon because she was born an esper. Her life was a hollow routine of pain and power... until the night her cell was shattered from the outside.

She ran.

Lost, starving, and alone in a ruined district, she collapsed-only to be found by a broke, ordinary teenage boy named Saitama.

He gave her a name.
He gave her a home.
He became her brother.

Years later, monsters stalk the cities, heroes rise and fall, and Saitama has become something beyond human. Nyx walks her own path in his shadow-hunting monsters after school, crushing Wolf-level threats, and clashing head-on with Tigers using brutal, close-combat psychic power.

The Hero Association is watching her.
An old martial artist is taking interest.
And the past that created her hasn't vanished.

Nyx doesn't want fame.
She doesn't want rankings.
She doesn't even want to be a hero.

She wants one thing.

To grow strong enough to make her brother finally take her seriously.

And to prove that she is no longer anyone's experiment.