Former Cabinet Intelligence Research Office employee Masahiro Yuko (Toyama Keiji) was detained for investigation on suspicion of murdering IT tycoon Kasai Shumei (Ishimaru Kanji). Until the verdict was finalized, Masahiro was held in Tokyo Detention Center, but her meeting was suddenly banned. Soon after the suspicious Special Missions Sugishita Ukyo (Mizutani Yutaka) and Kanjo Wataru (Sorimachi Takashi) began their investigation, Chief Cabinet Secretary Tsuruta Osuke (Aijima Kazuyuki) suddenly appeared and informed them of the shocking fact that Masahiro had committed suicide in the detention center. Suspecting that the cold-blooded Tsuruta had "sealed her mouth," the Special Missions began an investigation to find out the truth about Masahiro's death. Former lawyer Nakago Tsutoko (Oda Risa), who also had doubts about her death, began to act alone, but soon discovered that there were more complicated thoughts and conspiracies in the incident than she had imagined. Then, Wataru was arrested. @哦撸马