On-call substitute doctor Shugo suddenly finds himself faced with a terrifying criminal in a clown mask. The assailant demands that Shugo treat injured high school student Hitomi. The perpetrator sets siege to the building and Shugo finds himself confined with 64 unknown patients.
Unfortunately the movie Masked Ward is not yet available on HBO Max.
| Writing | Mikito Chinen | Novel |
| Writing | Mikito Chinen | Screenplay |
| Writing | Hisashi Kimura | Screenplay |
| Directing | Hisashi Kimura | Director |
| Visual Effects | Rei Asakura | VFX Supervisor |
| Production | Kazuya Hamana | Executive Producer |
| Production | Masayuki Morikawa | Producer |
| Production | Ikumi Taguchi | Producer |
| Production | Yuki Seike | Associate Producer |
| Writing | Shota Koyama | Co-Writer |
| Writing | Itaru Era | Co-Writer |
| Sound | Yutaka Yamada | Original Music Composer |
| Editing | 富永孝 | Editor |
| Production | Hiroaki Saito | Line Producer |
