The manga was adapted into two video games for WonderSwan and a Japanese live-action film directed by Higunchinsky. Eventually, the manga has received generally positive reviews from English-language critics and was nominated for an Eisner Award in 2003, and placed in the Young Adult Library Services Association's list of the "Top 10 Graphic Novels for Teens" in 2009.
An anime television series adaptation co-produced by Production I.G and Cartoon Network's Adult Swim has been announced, and is scheduled to premiere in 2020 in the United States on Adult Swim's Toonami programming block before Japan.
The story concerns the inhabitants of the small Japanese town of Kurôzu-cho that seems to be cursed by supernatural events surrounding spirals. Many people become obsessed or paranoid about spiral shapes, which starts resulting in several gruesome, realistically depicted deaths. Eventually, people start transforming into something other than human, such as snails and twisted forms. In the end the town is cut off from the rest of the world, which leads to apocalyptic events and a revelation about the secret hidden under the lake in the middle of the town.