Jigoku Shoujo: Mitsuganae

Following the second season, Ichimoku Ren, Wanyuudou, and Hone-Onna experience a period of peace. This changes when Kikuri returns to enlist their help. At the same time, Ai unexpectedly comes back from death, taking over the body of a schoolgirl named Yuzuki Mikage to resume the Jigoku Tenshin operation. Yuzuki is conscious of Ai's presence, as she can see what Ai sees.