Quirkless Yet Dangerous Siblings

Izuku Yagi was being beaten up by his friends (1-A and 1-B) as well his older brother and half twin sister, while he was being beaten up a black haired girl with almost black eyes was passing by she watch them beat Izuku until she recognized him, she hurry to defend and scared off both Izuku's older brother, sister and his friends. Later he finds himself in a hospital, there was two adults speaking to a doctor while beside him was the girl that save him, he take a look and see she is only two years older then him, the girl woke up and take a look at him, he feels scared and want to freak out but suddenly was hugged by her, this surprise him as he doesn't know who she is, he ask who she is only to reveal that she is his older sister named Hasumi.