TV Gate Keepers 21 Gate Keepers 21 5.5/10 by 2 users 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. Details Casts Posters Images Title Gate Keepers 21 Alternative Titles 捍卫者21, Gēto Kīpāzu Nijūichi, 게이트 키퍼즈 21, Хранители врат 21, 捍衛者21, Gatekeepers21 First Air Date 2002-04-24 Last Air Date 2003-01-08 Number of Episodes 6 Number of Seasons 1 Genres Animation, Action & Adventure, Sci-Fi & Fantasy, Drama, Networks , Casts Ikue Otani, Yukiko Hanioka, Tomokazu Seki, Mamiko Noto Plot Keywords , Ayane Isuzu (voice) Ikue Otani Miu Manazuru (voice) Yukiko Hanioka Nazo / Reiji Kageyama (voice) Tomokazu Seki Ghost Girl (voice) Mamiko Noto