You were put up for adoption after you were born because your mother died during your birth and your father (dabi) blamed you and put you up for adoption you are now 17 years old and the adoption center was attacked by the LOV which had shigaraki the leader, toga the bloodsucker, and dabi the second in command also your father

Shigaraki: we are here for a miss Sakura

Toga: was holding a blade to the caretaker’s neck

Dabi: stood there looking emotionless (You are Sakura btw)