Gate Keepers 21
ゲートキーパーズ21
We checked 8 streaming services in India on 04 Jun 2026 at 09:39 IST
About
It has been thirty two years since the Invaders have been defeated, and A.E.G.I.S is dismantled, with only a few Gate Keepers left. One of them, Ayane Isuzu learns that Machine General and Devil Count are back and they must save the Earth once more.
Cast
Seasons
Episodes
Season 1
Encounter
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...
Mad Dash
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.
Late Summer
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.
Ayane
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.
Miu
Miu's decides to visit Reiji at his headquarters, where they talk more about the Invaders, and Ayame.
The Sound of Wings
The Gatekeepers face their final confrontation against the Invaders.
Where does Gate Keepers 21 rank today?
Gate Keepers 21 is #2074 on the CineFlixo Daily Streaming Charts today.
- Highest: #2074
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Watch Gate Keepers 21 Online Free — All Episodes in HD
Stream Gate Keepers 21 online free in HD on CineFlixo. A talked-about animation, action & adventure, sci-fi & fantasy, and drama series originally produced in Japonés and released in 2002, it's earned a solid 5.0/10 from 3 viewers worldwide.
About Gate Keepers 21
It has been thirty two years since the Invaders have been defeated, and A.E.G.I.S is dismantled, with only a few Gate Keepers left. One of them, Ayane Isuzu learns that Machine General and Devil Count are back and they must save the Earth once more. Across 1 season and 6 episodes.
Gate Keepers 21 Cast and Characters
The cast features Ikue Otani (as Ayane Isuzu (voice)), Yukiko Hanioka (as Miu Manazuru (voice)), Tomokazu Seki (as Nazo / Reiji Kageyama (voice)), and Mamiko Noto (as Ghost Girl (voice)). Their performances are a major reason Gate Keepers 21 has built such a passionate audience.
Where to Watch Gate Keepers 21 Online
On CineFlixo you can watch Gate Keepers 21 free — no account, no credit card, no ads in the middle of the show. We stream the full series in 720p / 1080p HD, with subtitles when available, on any device: phone, tablet, laptop, or smart TV browser.
▶ Watch Gate Keepers 21 NowWhy People Are Watching Gate Keepers 21
Gate Keepers 21 flies under the radar but it deserves your attention. What makes it work is emotional weight that hits where it counts, action sequences that don't feel cheap, and world-building that respects the audience's intelligence. If you enjoy Japonés storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.
Frequently Asked Questions about Gate Keepers 21
Where can I watch Gate Keepers 21 online for free?
You can watch Gate Keepers 21 online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.
How many episodes does Gate Keepers 21 have?
Gate Keepers 21 has 6 episodes across 1 season. All episodes are available to stream right here on CineFlixo.
Is Gate Keepers 21 good? What's the rating?
Gate Keepers 21 holds a 5.0/10 rating based on 3 reviews — a niche pick worth checking out.
Who is in the cast of Gate Keepers 21?
The main cast includes Ikue Otani, Yukiko Hanioka, Tomokazu Seki, and Mamiko Noto.
Is Gate Keepers 21 available in Japonés?
Yes — Gate Keepers 21 was originally produced in Japonés and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.
When was Gate Keepers 21 released?
Gate Keepers 21 first aired in 2002.
Do I need an account to watch Gate Keepers 21 on CineFlixo?
No. CineFlixo is free and you can watch Gate Keepers 21 without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.
Similar Series You Might Like
If you enjoyed Gate Keepers 21, check out Duck Dodgers, Æon Flux, SNOWBALL EARTH, Mighty Little Bheem, and Rob the Robot.
Frequently Asked Questions
Where can I watch Gate Keepers 21 for free?
You can watch Gate Keepers 21 online for free on CineFlixo. All 6 episodes across 1 season are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.
How many seasons and episodes does Gate Keepers 21 have?
Gate Keepers 21 currently has 1 season and a total of 6 episodes. The series status is "Ended", so the episode count may grow as new seasons are released. You can browse the full episode list on CineFlixo and continue watching from where you left off.
What is Gate Keepers 21 about?
It has been thirty two years since the Invaders have been defeated, and A.E.G.I.S is dismantled, with only a few Gate Keepers left. One of them, Ayane Isuzu learns that Machine General and Devil Count are back and they must save the Earth once more. It belongs to the Animation, Action & Adventure, Sci-Fi & Fantasy, Drama genres.
In which language is Gate Keepers 21 originally available?
Gate Keepers 21 was originally produced in JA. On CineFlixo the show is available in its original JA audio. Check the player options on the watch page for available subtitle tracks.
When was Gate Keepers 21 first released?
Gate Keepers 21 first premiered on April 24, 2002 (2002). The series has since concluded its run.
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