| Gate Keepers | |
 Cover image of the first volume featuring Shun Ukiya (right) and Ruriko Ikusawa (left). | |
| ゲートキーパーズ (Gēto Kīpāzu) | |
|---|---|
| Genre | Harem, science fiction, mecha |
| Video game | |
| Developer | Entertainment Software Publishing |
| Publisher | Kadokawa Shoten |
| Genre | Tactical role-playing game |
| Platform | PlayStation |
| Released | December 19, 1999 |
| Manga | |
| Written by | Hiroshi Yamaguchi |
| Illustrated by | Keiji Gotoh |
| Published by | Kadokawa Shoten |
| English publisher | |
| Magazine | Ace Next |
| Demographic | Shōnen |
| Original run | 1999 – 2001 |
| Volumes | 3 |
| Anime television series | |
| Directed by | Koichi Chigira |
| Written by | Hiroshi Yamaguchi |
| Music by | Kohei Tanaka |
| Studio | Gonzo |
| Licensed by | |
| Original network | WOWOW |
| English network | |
| Original run | April 3, 2000 – September 18, 2000 |
| Episodes | 24 |
| Novel | |
| Gate Keepers 1985 | |
| Written by | Ko Yamaguchi (山口宏, Yamaguchi Kō) |
| Illustrated by | Akiko Asaki (朝来昭子, Asaki Akiko), Hideyuki Takenami (竹浪秀行, Takenami Hideyuki) |
| Published | January 30, 2003 |
| Related | |
Gate Keepers (ゲートキーパーズ, Gēto Kīpāzu) is a Tactical role-playing game developed by Entertainment Software Publishing and published by Kadokawa Shoten for the PlayStation. The game was then adapted into a manga series written by Hiroshi Yamaguchi and drawn by Keiji Gotoh and an anime series produced by Gonzo, and first aired on April 3, 2000. A six episode original video animation (OVA) sequel, Gate Keepers 21, was released in 2002. The main characters in the OVA sequel were the next generation of Gate Keepers.
All Gate Keepers series follow the same basic premise and share most of their characters, with some major discrepancies (mainly involving the character Reiji Kageyama). A character from the game, Francine Allumage is completely absent from the anime. Another character from the game Misao Sakamori, was replaced in the anime with the new original character Megumi Kurogane (though Misao does make a guest appearance towards the end of the anime).