Using a technology-nullifying “phantom gas” and giant humanoid robots called “Garann”, Shinkoku Nippon invades and conquers Japan, forming the puppet nation of Genkoku Nippon and preventing the Reiwa Era from beginning.
Under the harsh censorship of Genkoku Nippon, Japanese pop culture (such as anime, manga, and idols) is all but extinct.
Using “Garanndoll”, a secret weapon powered by otaku girls, Arahabaki fights back against Shinkoku Nippon.