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Region：Japan
Type：OVA
English name：Gate Keepers 21
Official name：ゲートキーパーズ21
Chinese name：地球守护者21
Other names：捍卫者21 / 捍卫者 GATE KEEPERS 21
Premiered：April 24, 2002
Status：Finished Airing
Tags：Science fiction / Robot war / Combat / Source game
Original author：山口宏
Director：山口宏
Scenario：山口宏
Storyboard：前田真宏 / 木上益治 / 片山一良 / 山口宏 / 佐藤順一
Co-director：竹下健一 / 追崎史敏 / 佐藤順一 / 山口宏 / 木上益治
Studios：GONZO
Family：Gate Keepers
Rating：12+

Gate Keepers 21

A.D. 2001.

The economy suffers from a lingering recession, crime is on the rise, the environment is under threat, morality has collapsed, the international situation is unstable...all in all, the future looks pretty bleak.

Oh, and humans are also about to be conquered by alien invaders.

With confusion reigning supreme, enter the invader hunters, members of the underground AEGIS Network resistance organization, who manipulate their pseudo-gate ability to hunt down the invaders.

Gate Keeper Isuzu Ayane happens to observe Manazuru Miyu, who has unusual telepathic powers.

She reports to the AEGIS Network that she has uncovered a real gate telepathist, then one day Ayane asks Miu, "Do you really want to know about your power?" Miu then decides to follow Ayane.

Suddenly invaders begin to appear in human guise!

PV EpisodesTiles view / List view

Main EpisodesTiles view / List view

EP1

Ayane Isuzu destroys some Invaders, and collects the crystals they leave behind. While looking for more Invaders, she sees a girl fly across the sky. After school the next day, Ayane meets with a mysterious man who tells her to locate a girl called Miu Manazuru, for she is a Gate Keeper. Ayane gives the man a bag of crystals in exchange for money. That night, Ayane approaches Miu, and tells Miu to join her in her effort to destroy the Invaders. Miu is wondering what to do, when they are suddenly surrounded by Invaders...
EP2

Ayane and Miu are chasing after a truck under control of the Invaders. Ayane manages to throw off the police that were following, and then tells Miu to fly over to the truck. Miu almost succeeds, but hits a highway sign instead. The next day, Miu and Ayane are at their school, when they see what appears to be a ghost. They decide to follow it, and in the process stumble upon an elevator that takes them to an underground complex. Down there they discover something that can help them find the Invaders.
EP3

Miu's school friends notice that Miu seems distant depressed. Miu's friends decide to take her to a karaoke lounge to try to cheer her up. They are in a singing room when an interruption occurs in the form of a power outage. Suddenly, Invaders start swarming all over the place. Ayane hears about the Invaders at the karaoke lounge, and goes to help.
EP4

A new Gate Keeper, Satoka Tachikawa, has appeared. She destroys Invaders to collect their crystal remnants for money. Ayane and Miu are outside of school when Satoka confronts them. She attempts to get Ayane to answer a question about her past, but Ayane manages to slip away. Later, Reiji notices signs of Invader activity, and Satoka rushes off to fight them.
EP5

Miu's decides to visit Reiji at his headquarters, where they talk more about the Invaders, and Ayame.
EP6

The Gatekeepers face their final confrontation against the Invaders.