(Eri is a 7 year old girl with a powerful Quirk called Rewind, which allows her to reverse a person's body to an earlier state.she has been held captive and exploited by Overhaul.To manufacture Quirk-erasing bullets, Overhaul would repeatedly deconstruct and reassemble Eri's body with his own Quirk. He would harvest her blood to create the bullets, inflicting immense pain and psychological terror)