In modern day Tokyo, three university students, Negishi Miyako (Neko-chan), Saiki Haruka, and Yamagishi Keiichiro, have magical powers that make them feel like outcasts. They come together one night and are transported to another world. They open a massive door and Neko finds that she is the Princess Neryulla, who must defeat the evil Duran III to free her people.
Unfortunately the movie Open the Door is not yet available on HBO Max.
| Production | Hidenori Taga | Executive Producer |
| Production | Satoshi Dezaki | Producer |
| Directing | Tsuneo Tominaga | Assistant Director |
| Production | Minoru Kotoku | Producer |
| Sound | Mark Goldenberg | Original Music Composer |
| Visual Effects | Yukari Kobayashi | Animation Director |
| Sound | Shigeharu Shiba | Sound Director |
| Writing | Katsumi Koide | Screenplay |
| Camera | Hiroshi Isakawa | Director of Photography |
| Directing | Takayuki Kaneko | Assistant Director |
| Writing | Satoshi Dezaki | Screenplay |
| Visual Effects | Setsuko Shibuichi | Character Designer |
| Art | Torao Arai | Art Direction |
| Visual Effects | Shinichi Suzuki | Key Animation |
| Visual Effects | Masakatsu Sasaki | Key Animation |
| Visual Effects | Yoshiaki Matsuda | Key Animation |
| Visual Effects | Kumiko Takahashi | Key Animation |
| Visual Effects | Michiko Noda | Key Animation |
| Art | Satoshi Dezaki | Storyboard Artist |
| Directing | Keizô Shimizu | Director |
| Writing | Motoko Arai | Novel |
