Um Sphinx 1 und 2 zu verfolgen, wird der ins Archiv verbannte Kriminalbeamte Shibazaki der Ermittlung zugeteilt. Noch während man das Umfeld der beiden Anschläge durchleuchtet, verkünden SPHINX, dass sie ein drittes Angriffsziel anvisiert haben. Wird Shibazakis Scharfsinn ausreichen,den Ort zu finden, an dem die Bombe versteckt ist.
Shibasaki transfers to the police agency heading the investigation, much to the dissatisfaction of several employees. As he constructs another bomb, Nine deduces from the presence of counter-nuclear terrorism special forces that the police are aware of his and Twelve's stealing of the plutonium from the Aomori nuclear facility, but intends to confirm his suspicions through another attack. Talking with the chief of police, Shibasaki learns one of the men who stole the plutonium worked at the nuclear facility for a short time, and had his identity erased after the incident occurred. Shibasaki then laments to the chief that, as a Hiroshima native, he hated summer due to the fears held by the older townspeople who experienced the town's atomic bombing during World War II. Nine and Twelve send a third video with another riddle related to Oedipus Rex. Finally unable to bear with her mentally-unstable mother, Lisa runs away from home. Solving the riddle, the police streams a live recording of Shibasaki all over Japan, in which he announces the location of the newest bomb. He then issues a direct challenge to Nine and Twelve before the police is forced to cut off the livestream. Viewing news and surveillance footage and realizing the officers were wearing hazmat suits, Nine realizes the police have definitely connected them to the stolen plutonium. The chief of police reveals to other officers the reason behind Shibasaki's demotion, as Shibasaki steps outside the building and comments, "Today's another hot day."
Shibazaki intègre l'agence en charge de l'enquête. Il suit une piste au sujet du vol de plutonium et lance un défi publiquement.
スピンクス1号・2号を追うため、文書課の刑事・柴崎が捜査に加わることになった。2つの事件の周辺を洗う中、スピンクスが第三の標的を発表する。
柴崎の推理は爆弾のありかを突き止めることができるか。
스핑크스의 테러 예고를 정확하게 맞췄던 시바자키는 형사과로 다시 돌아오게 된다. 그리고 나인과 트웰브는 이번에도 수수께끼로 된 테러 예고를 동영상 사이트에 업로드하는데...
Сибадзаки возвращается в агентство и берет на себя руководство расследованием. В это время «Сфинксы» выпускают новое видео-загадку, но на этот раз Сибадзаки готов сделать ответный удар.
為了追踪Sphinx 1號2號，文書課的刑警柴崎也加入了其中。正在調查兩個事件時，Sphinx又發表了第三個目標。柴崎的推理是否能找到放置炸彈地方呢？
Shibazaki si trasferisce all'agenzia assumendo il comando delle indagini. Dopo avere seguito una pista che riconduce al furto del plutonio, lancia una sfida pubblica.
