Series

Gate Keepers 21

★ 5.0(3)200226m1 season

Animation Action & Adventure Sci-Fi & Fantasy Drama

Gate Keepers 21 is streaming on U-NEXT, Anime Times Amazon Channel and dAnime Amazon Channel in Japan, and available to rent or buy on Amazon Video. Availability checked 17 June 2026.

Where to watch Gate Keepers 21

🇯🇵 Japan

U-NEXTStream

Anime Times Amazon ChannelStream

dAnime Amazon ChannelStream

Amazon VideoRent

Good to know

Creator: Hiroshi Yamaguchi
Release date: 2002-04-24
Runtime: 26m
Language: Japanese
Seasons: 1
Episodes: 6
Status: Ended
Country: Japan
Studio: GONZO

About Gate Keepers 21

Gate Keepers 21 is a 2002 web series in the Animation, Action & Adventure and Sci-Fi & Fantasy genres, created by Hiroshi Yamaguchi, starring Ikue Otani, Yukiko Hanioka and Tomokazu Seki. It spans 1 season and 6 episodes. It holds an average rating of 5.0/10 from 3 viewers. Below you can see where to watch Gate Keepers 21 in Japan — across streaming, rental and purchase options — along with the full cast, trailer and viewer reviews.

Synopsis

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.

Seasons (1)

Season 16 eps · 2002

Cast

Ikue Otani

Ayane Isuzu (voice)

Yukiko Hanioka

Miu Manazuru (voice)

Tomokazu Seki

Nazo / Reiji Kageyama (voice)

Mamiko Noto

Ghost Girl (voice)

Themes & keywords

science fictionanimationalien invaders

Frequently asked questions

Where can I watch Gate Keepers 21 in Japan?+

In Japan, you can stream Gate Keepers 21 on U-NEXT, Anime Times Amazon Channel and dAnime Amazon Channel. It's also available to rent or buy on Amazon Video.

Is Gate Keepers 21 on Netflix?+

Gate Keepers 21 is not on Netflix in Japan right now, but you can stream it on U-NEXT, Anime Times Amazon Channel and dAnime Amazon Channel.

How many seasons of Gate Keepers 21 are there?+

Gate Keepers 21 has 1 season and 6 episodes in total.

Who stars in Gate Keepers 21?+

Gate Keepers 21 stars Ikue Otani, Yukiko Hanioka, Tomokazu Seki and Mamiko Noto.

When did Gate Keepers 21 come out?+

Gate Keepers 21 is a 2002 web series created by Hiroshi Yamaguchi.

What genre is Gate Keepers 21?+

Gate Keepers 21 is Animation, Action & Adventure, Sci-Fi & Fantasy and Drama series.

Who created Gate Keepers 21?+

Gate Keepers 21 was created by Hiroshi Yamaguchi.