Ayane Isuzu
main character
OVA
6.2
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Episode: 0 / 6
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Anime DetailsFINISHED
Format:OVA
Episodes:6
Episode Length:30 mins
Season:SPRING 2002
Source:video game
Estimated watch time
3h
⚡ 2 days at 5 eps/day
Tags & Tropes
Aliens20%
overview details
Synopsis & Story
32 years have passed since the initial defeat of the Invaders. A.E.G.I.S is all but dismantled now and has become an underground organiziation consisting of only a few Gate Keepers left to save humanity. One of the members, Ayane Isuzu, is sick of society as a whole, though she continues to defeat the Invaders out of spite for her father. Suddenly, she learns of the revival of Machine General (Kikai Shogun) and Devil Count (Akuma Hakushaku), but a mysterious ghost girl now accompanies them. It is up to Ayane and the remnants of A.E.G.I.S to stop them and save humanity once again. (Source: Anime News Network)
Trailer
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Featured Cast & Voice Actors
Franchise Universe & Related Entries
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Aniphoria guide
Gate Keepers 21: should you watch it?
At a glance
Gate Keepers 21 has been met with mixed reactions, with an average AniList score of 62/100 — 28% of 723 ratings are 8/10 or higher.
It ranks #18 highest-rated anime of 2002, and #25 most popular anime of 2002 on AniList.
Of the 1.3K AniList users who started it, 5.3% dropped it, so it is dropped at a typical rate; 1.1K have finished it.
At about 3 hours in total, it is a short commitment — a weekend binge.
Best for viewers who enjoy Action, Drama, Sci-Fi.
Where it fits in the series
- Watch first: Gate Keepers (2000)
Episodes
6 episodes are listed.
Main cast & creators
- Character design
- Keiji Gotou
- Music
- Kouhei Tanaka
Gate Keepers 21 FAQ
- How many episodes does Gate Keepers 21 have?
- Gate Keepers 21 has 6 episodes of about 30 minutes each, roughly 3 hours in total.
- How long does it take to watch Gate Keepers 21?
- About 3 hours back to back. At two episodes a day it takes 3 days; at one hour a day, about 3 days.
- Is Gate Keepers 21 finished?
- Yes. Gate Keepers 21 has finished airing — the final episode aired January 8, 2003.
- Is there a season 2 of Gate Keepers 21?
- No sequel is listed for Gate Keepers 21 as of October 2026.
- What should I watch before Gate Keepers 21?
- Watch Gate Keepers first — Gate Keepers 21 is a direct sequel.
- Is Gate Keepers 21 based on a video game?
- Yes. Gate Keepers 21 adapts the video game.