All Might, Endeavor and Eraserhead get captured and wake up in a cell. They find they aren't the only ones there soon after. Kids of all ages with varying Quirks sit in the cells around them. Among the kids is a girl who shares a cell with the Pros. She explains the true purpose behind the facility: to create the ultimate villains through breeding. The Pro heroes find themselves the "lucky" carriers for the next set of "specimens" and learn about the girls history during their time in the facility.