Dark Cat

Aimi, a middle school student with asthma that often causes her to miss school, greets her childhood friend Hiroki at school, but he responds with indifference. While cleaning, a new student named Kagezaki Shimoi approaches the White Snake Mound, a site associated with local legends, and discovers a skeleton. The story also involves Kagezaki Hyoi, a dark cat who fights demons that possess people, and his younger brother Rui.