Ryujin Misaki, located at the edge of the Genkai Sea, is known as an isolation ward for leprosy patients. When Saotome, a sword master and guard of the Shogun, hears news of a doctor gone missing, he begins to suspect that things are not what they seem at Ryujin Misaki. Intent on discovering the truth, Saotome launches a private investigation.
Unfortunately the movie The Mysterious Cape is not yet available on HBO Max.
| Directing | Yasushi Sasaki | Director |
| Writing | Mitsuzō Sasaki | Original Story |
| Writing | Shinji Kessoku | Screenplay |
| Camera | Ko Matsui | Director of Photography |
| Sound | Shigeji Nakayama | Sound Recordist |
| Sound | Eiichi Yamada | Original Music Composer |
| Lighting | Yoshiaki Masuda | Lighting Technician |
| Editing | Shintarō Miyamoto | Editor |
| Art | Takatoshi Suzuki | Art Direction |
| Crew | Tadaoto Kainoshō | Thanks |
