In this story is the story of triple who is Ackerman. Rivaille loss his memories when shinagashina wall fall and causing Rivaille to be hit in the head by a falling rock. Rivaille is underground after the shinagashina wall fall and is guarded by two Fritz. Rivaille was trained by two Fritzs, Adrian Fritz and Eldia Fritz. Rivaille does not remember that he had two older twins and Rivaille was the youngest twin.