A 12-episode anime TV series adaptation produced by P.A. Works and directed by Tsutomu Mizushima. Aired in Japan between January 10 and March 27, 2012. The screenplay was written by Ry┼ì Higaki, and the chief animation director Yuriko Ishii based the character design used in the anime on Noizi Ito's original concept. The music was produced by Kow Otani, and the sound director is Yoshikazu Iwanami. The anime has two theme songs: the opening theme "Ky┼ìmu Densen" (σç╢σñóΣ╝¥μƒô Nightmare Contagion?) by the band Ali Project, and the ending theme "Anamnesis" by Annabel.