The year is 2019, right before Japan changes over to a new historical era. A dimensional rift suddenly opens up in the sky and on the other side lies a topsy-turvy world with an alternate version of Japan called Shinkoku Nippon. In this parallel world, Japan has maintained its former militarism, remaining in an eternal Showa era. Shinkoku Nippon invades the Japan we know, deploying “Genmu”, gas weapons that nullify our modern day weapons, and giant humanoid weapons called “Garann”. In the blink of an eye, the invaders seize control of the government and conquer virtually all of Japan. And thus, the Reiwa era is never ushered in.

A decade later, Japan has lost its name and sovereignty—now existing as Genkoku Nippon, a vassal state of Shinkoku Nippon. Under harsh censorship, the once thriving manga, anime, idol, and other subcultures have completely died off...or so it seemed.

But otaku culture is not dead!

There exists a group of people who directly oppose Shinkoku Nippon in order to protect Japan’s subcultures. The name of this secret society is Arahabaki, and their main weapons are “Garanndolls”, powered by female warriors who have come to be called “Battery Girls”.