This episode goes back to events that occur some 3 years before the first two episodes. Kagura was placed under the care of the Isayama family at a very young age, after her mother was killed in battle and her father inherited her Ga-rei Byakuei and the duties this entailed. The girls quickly bond, drawn to each other by Kagura's pain of losing her mother, the deep sense of duty towards her family, and Yomi's wish for a sister. Yomi introduces Kagura to the SDCD field team led by Kouji Iwahata, a veteran SDCD operator, and Kagura begins to understand what fighting against spirit beings really looks like.