is a six-part sequel OVA series to the Gate Keepers animated TV series and has a darker and more serious plot than its predecessor. Some of the questions left unanswered in the TV series are answered in this sequel. Linking the two series are the characters Reiji Kageyama, Yukino Houjo, and the former Far Eastern AEGIS Headquarters setting, Tategami High School. Plot Thirty one years have passed since the Far Eastern Branch of AEGIS and the Invaders waged war in Japan. Big businesses thrived until the eighties (when the Shōwa period ended with the death of Hirohito). The heyday of growth and prosperity have passed, the crime rate has increased, environmental problems have worsened, and the international situation has become increasingly unstable. The bright future that people hoped for is spiraling out of the reach of the common citizen. Coupled with the decline in the values and morals of the Japanese people comes the emergence of a new type of Invader. No longer an alien entity, the Invaders can now absorb ordinary humans into their ranks. Officially disbanded and discredited, the few remaining remnants of AEGIS have formed a clandestine network of operatives to hunt down and destroy the Invaders. The premier agent of the AEGIS Network is the antisocial Ayane Isuzu who collects the crystal remains of Invader in exchange for money doled out by the mysterious Reiji Kageyama. Characters An intelligent student, Ayane is ranked third-highest of her entire class at Tategami High School. Ayane's classmates consider her to be a geek and more than a little strange, not only because she is seldom seen without her computer, but also because of her introverted attitude and near-hostility to social situations. She has a strong resemblance to Saemi Ukiya but she has an attitude reminiscent of Megumi Kurogane. When Ayane battles Invaders, she prefers to use pre-programmed imitation Gates that are triggered by specially designed cellular phones. She often uses her computer to strategically time the deployment of the imitation Gates, and also uses various tracking programs to detect and home in on Invader activity. She is bitter about almost everything, as if she does not care about her surroundings, which is why she has few to no friends at all. Her past is revealed bit-by-bit in each episode, including her reason for avoiding any of the connections to her father. She and her mother were left to fend