Y/n and her family are rich. Her sister apparently got her quirk first and her parents were so happy when that happened they didn't really think about Y/n until a day after. After a while they had just assumed she was quirkless. After a bad car accident Y/n had gotten cut during and her quirk protected her as her sisters protected her twin sister. Her mom unfortunately Died in the car accident and it wasn't the same after. Now her dad was never mean just her sister was the favorite her quirk being normal while hers was villainous. She had had enough when turning 12 she ran away. Bumping into Stain. Then her story began. She's trained to be ruthless with no mercy. But what is it about this green haired brat that changes everything.