The three brothers discover that the human experiment banned after destroying the "Orochi", is still going on to secretly revive the evil snake. They also find out that some ex-members of the Yamainu (the Japanese military unit formed to kill the snake) are behind this conspiracy. The brothers fight together again in a battle against the military.
You can now watch Donten: Laughing Under the Clouds - Gaiden: Chapter 3 - Conspiracy of the Military online on the following streaming providers in the United States.
| Directing | Tetsuya Wakano | Director |
| Visual Effects | Miyuki Kowata | Color Designer |
| Writing | Tomomi Kawaguchi | Screenplay |
| Writing | Eiji Umehara | Series Composition |
| Writing | Eiji Umehara | Screenplay |
| Visual Effects | Tetsuya Matsukawa | Character Designer |
| Visual Effects | Kenji Fujisaki | Character Designer |
| Directing | Sunghoo Park | Action Director |
| Directing | Tetsuya Wakano | Action Director |
| Visual Effects | Takuma Ebisu | Animation Director |
| Sound | Shoji Hata | Sound Director |
| Sound | Shoji Hata | Sound Mixer |
| Sound | Haruka Matsushita | Sound Recordist |
| Editing | Katsuhiro Kimura | Online Editor |
| Sound | Kohei Chida | Music Director |
| Sound | Mami Takaishi | Music Producer |
| Art | Tetsuya Wakano | Storyboard Artist |
| Production | Toshio Iizuka | Executive Producer |
| Art | Takashi Kawabata | Storyboard Artist |
| Art | Takayuki Tanaka | Storyboard Artist |
| Visual Effects | Kii Tanaka | Character Designer |
| Visual Effects | Kii Tanaka | Supervising Animation Director |
| Art | Mai Teshima | Prop Designer |
| Art | Kenji Fujisaki | Prop Designer |
| Art | Shinya Asanuma | Prop Designer |
| Visual Effects | Megumi Yamashita | Supervising Animation Director |
| Visual Effects | Yoshiaki Tsubata | Supervising Animation Director |
| Visual Effects | Yuki Masuya | Animation Director |
| Visual Effects | Yuki Masuya | Key Animation |
| Visual Effects | Yumi Shimojo | Animation Director |
| Visual Effects | Yumi Shimojo | Key Animation |
| Visual Effects | Tamami Izawa | Animation Director |
| Visual Effects | Tamami Izawa | Key Animation |
| Visual Effects | Tatsuaki Okamoto | Animation Director |
| Visual Effects | Tatsuaki Okamoto | Key Animation |
| Visual Effects | Reina Kawasaki | Animation Director |
| Directing | Kenji Takahashi | Assistant Director |
| Visual Effects | Reina Kawasaki | Key Animation |
| Visual Effects | Erika Nishihara | Animation Director |
| Visual Effects | Erika Nishihara | Key Animation |
| Visual Effects | Akari Minagawa | Animation Director |
| Visual Effects | Masami Nagata | Animation Director |
| Visual Effects | Masami Nagata | Key Animation |
| Visual Effects | Shiho Tanaka | Animation Director |
| Visual Effects | Shiho Tanaka | Key Animation |
| Visual Effects | Yuri Naminoue | Animation Director |
| Visual Effects | Masaki Hinata | Animation Director |
| Visual Effects | Hanako Mitsubachi | Animation Director |
| Visual Effects | Hanako Mitsubachi | Key Animation |
| Visual Effects | Koichi Usami | Key Animation |
| Visual Effects | Sunghoo Park | Key Animation |
| Visual Effects | Sachiko Matsumoto | Key Animation |
| Visual Effects | Shinichi Nozaki | Key Animation |
| Visual Effects | Asami Shimizu | Key Animation |
| Visual Effects | Nao Miyawaki | Key Animation |
| Visual Effects | Yasuhiro Saiki | Key Animation |
| Visual Effects | Manabu Yasumoto | Key Animation |
| Visual Effects | Hisateru Manabe | Key Animation |
| Visual Effects | Naoto Yoshida | Key Animation |
| Visual Effects | Yukie Sasaki | Key Animation |
| Visual Effects | Harumi Tsunoda | Key Animation |
| Visual Effects | Kumiko Kawashima | Key Animation |
| Visual Effects | Yusuke Shingu | Key Animation |
| Visual Effects | Yuji Hakamata | Key Animation |
| Visual Effects | Tomosato Hosokawa | Key Animation |
| Visual Effects | Yu Ogasawara | Key Animation |
| Visual Effects | Kyoko Kotani | Key Animation |
| Visual Effects | Tomoko Nitta | Key Animation |
| Visual Effects | Yui Mizushima | Key Animation |
| Visual Effects | Eri Kamiyama | Key Animation |
| Visual Effects | Sun Meng | Key Animation |
| Visual Effects | Miho Kawasaki | Key Animation |
| Visual Effects | Ai Asari | Key Animation |
| Visual Effects | Makiko Hayase | Key Animation |
| Visual Effects | Yurika Nakanishi | Key Animation |
| Visual Effects | Miyachi | Key Animation |
| Visual Effects | Satsuki Tamura | Key Animation |
| Visual Effects | Katsunori Tanaka | Key Animation |
| Visual Effects | Tomoko Hamanaka | Key Animation |
| Visual Effects | Nanako Ninomiya | Key Animation |
| Visual Effects | Liu Yunliu | Key Animation |
| Visual Effects | Rie Aoki | Key Animation |
| Visual Effects | Yukari Watabe | Key Animation |
| Visual Effects | Kumiko Kakoi | Key Animation |
| Visual Effects | Miho Matsuura | Key Animation |
| Visual Effects | Hiroyuki Hojo | Key Animation |
| Visual Effects | Yoshimi Imagawa | Key Animation |
| Visual Effects | Suguru Iijima | Key Animation |
| Visual Effects | Noriko Hatta | Key Animation |
| Visual Effects | Ayako Kakiuchi | Key Animation |
| Visual Effects | Kaori Ikeda | Key Animation |
| Visual Effects | Yasuyuki Ebara | Key Animation |
| Visual Effects | Nobuhiko Kawakami | Key Animation |
| Visual Effects | Lu Hongxi | Key Animation |
| Visual Effects | Chen Zhongning | Key Animation |
| Crew | Ayuko Harada | Special Effects |
| Art | Miu Miyamoto | Art Direction |
| Art | Miu Miyamoto | Background Designer |
| Art | Ibuki Miyamoto | Background Designer |
| Art | Tetsuhiro Shimizu | Background Designer |
| Camera | Yuuki Aida | Director of Photography |
| Camera | Hideki Imaizumi | Director of Photography |
| Sound | Noriko Izumo | Sound Effects |
| Sound | Yutaka Yamada | Original Music Composer |
| Production | Yoshimasa Okunaga | Producer |
| Production | Youko Ueda | Producer |
| Production | Noriko Kosukegawa | Producer |
| Directing | Tetsuya Wakano | Second Unit Director |
| Directing | Kenji Takahashi | Second Unit Director |
| Directing | Hitomi Ezoe | Second Unit Director |
| Directing | Yusuke Kubo | Second Unit Director |
| Directing | Naoko Takeichi | Second Unit Director |
| Sound | Masafumi Watanabe | Foley Artist |
| Visual Effects | Yuzuru Funakoshi | Compositing Artist |
| Visual Effects | Shinya Kanetake | Compositing Artist |
| Visual Effects | Mai Nakamura | Compositing Artist |
| Visual Effects | Fumiya Shima | Compositing Artist |
| Visual Effects | Fumiaki Nimura | Compositing Artist |
