In Japan, a government agency called the Supernatural Disaster Countermeasures Division (SDCD) exists to shield citizens from unseen creatures. They can eliminate these monsters quickly and without alerting the general public. However, they currently face a different challenge: the betrayal of one of their own. After her mother died several years ago, Kagura Tsuchimiya was taken in by the Isayama family and formed a close, sister-like bond with their daughter, Yomi. The two became inseparable and worked together for the SDCD as highly skilled exorcists. Yet, as the stress and consequences of their sacred duty weighed on them both, and family politics came into play, Kagura and Yomi began to slowly drift apart. One of them earnestly embraced her role as an exorcist, while the other headed down a dark path from which there may be no redemption.