Production company Twin Engine has officially announced a television anime adaptation of the supernatural fantasy manga Spirit Circle, created by Satoshi Mizukami. The series is slated for a December 2026 premiere and is confirmed to span 18 episodes. According to the production website, the project is being directed by Tatsuo Satou, who is also responsible for series composition, with character designs by Satoru Fujimoto. The animation is being produced by studios EOTA and Nagomi. The main cast features Kazuki Ura and Anna Nagase, both of whom are credited with performing multiple roles, reflecting the story's focus on reincarnation. Anna Nagase is also set to perform the ending theme, 'Koko ga Donna Sekai demo.' The original manga was serialized in Young King OURs from 2012 to 2016, concluding with six volumes. The story centers on 14-year-old Fuuta Okeya, who discovers that his classmate Kouko Ishigami is his sworn enemy from a series of past lives, a connection explored through the titular 'spirit circle' that allows him to revisit his previous incarnations.