A man confessed to killing a woman in a labyrinth 2 years ago. The detectives must now conduct a "backing investigation" to determine whether his confession is true, because the law states that a confession alone is not enough to make the case. The 20nd work from the popular series "Keishicho Monogatari", which documents the activities of the First Investigation Division of the Capital Police Department.
| Actor | Role |
|---|---|
 Yūji HoriDetective Nagata | Detective Nagata |
 Tokue HanazawaDetective Hayashi | Detective Hayashi |
 Hiroshi MinamiDetective Azuma | Detective Azuma |
 Rinichi YamamotoDetective Kaneko | Detective Kaneko |
 Takashi KandaChief Detective | Chief Detective |
| SShirō ŌkiDetective Takatsu | Detective Takatsu |
 Kenji ImaiNot listed | Not listed |
 Machiko YashiroNot listed | Not listed |
 Yuko KobayashiNot listed | Not listed |
 Hisashi IgawaNot listed | Not listed |
 Ken SudoDetective Watanabe | Detective Watanabe |
| AAkira TakizawaNot listed | Not listed |
| JJun KiyomiNot listed | Not listed |
| TTadashi SuganumaNot listed | Not listed |
| OOsamu YamanouchiNot listed | Not listed |
| FFusatarō IshijimaNot listed | Not listed |
 Gōzō SōmaNot listed | Not listed |
| KKoji TakishimaNot listed | Not listed |
 Kenji UshioNot listed | Not listed |
| RRyuichi FujiyamaNot listed | Not listed |
| MMidori YamamotoNot listed | Not listed |
 Sadako SawamuraNot listed | Not listed |
| 木木村梢Not listed | Not listed |
| HHisako YaoharaNot listed | Not listed |
| YYoshikazu SugiNot listed | Not listed |
 Teruko KishiNot listed | Not listed |
| KKeiko TsukimuraNot listed | Not listed |