Rin accompanies Yukio on a mission. The threat is Kuro, a cat sídhe familiar owned by Shiro, who has gone berserk after hearing that his master has died. Kuro was a guardian deity, but turned into a demon after the shrine was demolished. Shiro was the only Exorcist able to calm him down without hurting him. Rin confronts Kuro with the same mentality, calms him down, and becomes his new guardian. Yukio gives Kuro silver vine sake, a special present Shiro had left for him.