Saya Toma is a female detective with an IQ of 201. Takeru Sebumi is a career detective with a distinguished background. They work on cases by postulating the "SPEC" of the unknown criminals and then deduce the criminal's unknown "SPEC" to make arrests. A mystery occurs when bodies are found on a cruiser in the ocean. Saya Toma and Ryo Kase of the Tokyo Metropolitan Police Department are brought in to solve the case.
| Actor | Role |
|---|---|
 Erika TodaSaya Toma | Saya Toma |
 Ryo KaseTakeru Sebumi | Takeru Sebumi |
 Ryunosuke KamikiJuichi Ninomae | Juichi Ninomae |
 Chiaki KuriyamaSatoko Aoike | Satoko Aoike |
 Saki FukudaMirei Shimura | Mirei Shimura |
 Atsushi ItoNot listed | Not listed |
 Takahiro MiuraTamaki Miyano | Tamaki Miyano |
 Kippei ShiinaSukehiro Tsuda | Sukehiro Tsuda |
 DendenKenzo Ichiyanagi | Kenzo Ichiyanagi |
 Yuko AsanoMadame Yo | Madame Yo |
 Raita RyuKotaro Nonomura | Kotaro Nonomura |
 Akaji MaroAkira Nitanai | Akira Nitanai |
 Go RijuKaoru Fukutomi | Kaoru Fukutomi |
 Kasumi ArimuraMiyabi Masaki | Miyabi Masaki |
 Kohki OkadaKaoru Baba | Kaoru Baba |
 Kazuyuki MatsuzawaAyumu Shikahama | Ayumu Shikahama |
 Ryuji SaineiSouji Inomada | Souji Inomada |
| KKoji IshikawaRupu father | Rupu father |