Two guardians of the Nijo Castle, Shioya and Kamazawa, discover a map leading to a secret passage to Edo Castle. Instead of reporting their find to local authorities, they decide to blackmail the lords who created the forbidden passage. To prove their crime, Magistrate Toyama Kinshiro launches a private undercover investigation.
| Actor | Role |
|---|---|
 Chiezo KataokaNot listed | Not listed |
 Shinjirō EharaNot listed | Not listed |
 Keiko YukishiroNot listed | Not listed |
 Hiroko SakuramachiNot listed | Not listed |
| CChie UekiNot listed | Not listed |
 Harumi UrazatoNot listed | Not listed |
| KKenji SusukidaNot listed | Not listed |
 Kensaku HaraNot listed | Not listed |
 Kodayu IchikawaNot listed | Not listed |
 Nakajirō TomitaNot listed | Not listed |
 Tony TaniNot listed | Not listed |
| TTokubei HanayagiNot listed | Not listed |
 Eijirō YanagiNot listed | Not listed |
 Ryūnosuke TsukigataNot listed | Not listed |
 Kusuo AbeNot listed | Not listed |