- 1 Season
In this epic prequel to the Gai-Rei series, Gai-Rei: Zero details the story of Kagura Tsuchimiya and Yomi Isayama and how the sister-like friends became bitter rivals. Suffering from respective tragedies the two girls struggle to overcome their family burden of being exorcists and fight to survive in a world where you can show no weakness. So when the Japanese Ministry of Defense's Paranormal Disaster Countermeasure Headquarters is decimated by Kasha (invisible spirits) and a mysterious woman wielding a katana everyone is baffled. The attack leaves only a small portion of the task force, including one katana wielding school girl, alive. All that's left for the Paranormal Disaster Coutermeasure Headquaters and the assisting Supernatural Disaster Countermeasures Division to do is to figure out what caused Yomi Isayami to go rogue and how Kagura Tsuchimiya is connected.