As the great military commander Nobunaga Oda was consolidating his power across Japan, one of his actions was to wipe out a clan of assassins, killing every man, woman and child he found in the village. Years later, one of the survivors has hired a young but skilled assassin to avenge the deaths of his friends and family. His mission: to sneak into the most heavily guarded castle in Japan, and kill the supreme ruler of the country.
Unfortunately the movie Owls' Castle is not yet available on HBO Max.
| Writing | Ryōtarō Shiba | Novel |
| Production | Shigeaki Hazama | Producer |
| Writing | Masahiro Shinoda | Writer |
| Editing | Hiroshi Yoshida | Editor |
| Production | Masaru Koibuchi | Producer |
| Directing | Masahiro Shinoda | Director |
| Sound | Joji Yuasa | Original Music Composer |
| Writing | Katsuo Naruse | Writer |
| Camera | Tatsuo Suzuki | Director of Photography |
| Costume & Make-Up | Setsu Asakura | Costume Design |
| Directing | Junji Yamaoka | Action Director |
| Art | Yoshinobu Nishioka | Production Design |
| Costume & Make-Up | Tomoo Haraguchi | Special Effects Makeup Artist |
| Visual Effects | Yukitomo Tochino | Special Effects Supervisor |
