Den-noh Coil, Coil — A Circle of Children, is a Japanese science fiction anime television series depicting a near future where semi-immersive augmented reality technology has just begun to enter the mainstream. The series takes place in the fictional city of Daikoku, a hotbed of AR development with an emerging city-wide virtual infrastructure. It follows a group of children as they use AR glasses to unravel the mysteries of the half real, half Internet city, using a variety of illegal software tools, techniques, and virtual pets to manipulate the digital landscape.

Den-noh Coil, in development for over a decade, is the series director debut of Japanese animator Mitsuo Iso. It premiered on NHK Educational TV on May 12, 2007. Due to the animators involved in its production and its unusually high-profile television broadcast time slot, Den-noh Coil was highly anticipated.

In the city of Oedo 2808 A.D., three Cyber criminals are given two choices, to either rot in jail or to join a special force of the Cyber Police to possibly get one more chance at freedom. For each criminal apprehended, and for each successful mission done, the state will agree to reduce their sentences. Lead by Hasegawa, the new recruits: Sengoku, Gogul, and Benton will bring some hard justice to Oedo, and possibly taste freedom once again.