Four years before Akibaranger, there was this short series about a three women super heroine team (a gravure model, a mangaka and a maid) who protect the electric city from creepy nerds turned evil.

Akiballion: Battlemaids of Akihabara

The story takes place in the alternate world slightly different from ours. In United Republic of Great Japan; which has become the world’s strongest nation; it is reported that a new breed of athletes is setting a phenomenal new world record, winning every sports game. Prompted by the pressure from other nations, the organization that supervises the country’s sports events, decides to look into the matter; but the entire investigation team goes missing just when it started the mission. What the investigation team witnessed was “Athlete-roid. Koumoto executive director of Great Japan Heavy Industries is planning to dominate the world market for special military-use robots by promoting the army of invincible “Athlete-roid.”...

Tokyo Ballistic War Vol.2 - Cyborg High School Girl VS. Cyborg Beautiful Athletes

Tokyo Ballistic War Vol.1 - Cyborg High School Girl VS. Cyborg Beautiful Athletes

Ai manages to win the battle against DNJ-02, but she runs out of fuel after using the Wave Motion Gun, and is abducted by a cyborg soldier right in front of Megumi. Ai's body is disassembled by Koumoto, executive director of Great Japan Heavy Industries, and she loses all the memories because of the computer virus affecting her system. Meanwhile,Megumi sets out for Great Japan Heavy Industries on her own in order to save the captured Ai.