On a sunny July day in the 41st year of the Shinka Era, Jirou Hitoyoshi is tasked with covertly listening in on a secret meeting between a top government scientist and an industrial spy. However, his cover is blown, and the spy reveals himself to be an alien in disguise. Amidst the ensuing chaos, Jirou enlists the aid of cafe waitress and magical girl Kikko Hoshino, one of many "superhumans" who blend into society and secretly protect humanity from extraterrestrial threats. As a member of the government agency known as the Super Population Research Laboratory, Jirou has the dual task of protecting superhumans that defend humanity and disposing of any deemed too dangerous to live. Having proven herself a worthy ally, Kikko is invited to join the agency as its newest recruit. Fast forward five years: disapproval and distaste for superhumans are now commonplace in Tokyo. From government corruption and conflicting ideas of justice, to the morality of superhuman rights, the relationship between humans and the supernatural minority balances precariously in a world pervaded by whispers of unrest and unease. Under mysterious circumstances, Jirou has betrayed the agency, and is now a fugitive on the run. As he skulks through the rainy back alleys of Shinjuku, he is pursued by the very same superhumans that he himself once recruited. [Written by MAL Rewrite]

Anime Consortium Japan (ACJ) revealed the original production Concrete Revolutio: Choujin Gensou at Anime Expo 2015 in Los Angeles. The project had previously been teased by scriptwriter Shou Aikawa in the Tokusatsu Hiho magazine, published in May 2015, under the tentative title Choujin Gensou. Aikawa indicated that the project would be a superhero story in a setting similar to the American comic book series Watchmen.