Akumu is a girl with a pretty strong quirk named nightmare. akumu can make the enemy's nightmare come true and drive him mad. also she is overhaul's daughter, the most famous yaguza in Japan. Overhaul train her to be the next yaguza but heroes catch her killing by accident at the age of 10 and sent her to jail for 3 years. at jail the heroes make a program for the prisoners,prisoners when they end their sentence can go to UA if they want to make a new start and be heroes. Akumu went to UA and became a hero