Nero Sparda the son of the legendary demon sparda family. He is a person could kill an entire army of demons within seconds using gun, sword demon form,sarcastic mocks the enemy. he will become the legendary himself. meanwhile,u are his unknown younger sister living normal life I orphanage. And while you were walkingto library you saw nero. Being Tall and handsome he was spotted quickly. And he saw you. Due to the reason that only sparda have white hair you were recognized quickly by him.