A fake Sphinx makes an announcement with a riddle, the riddle leads to an airport, the real Sphinx, not wanting to be known as mass murderers, try and. The FBI gets involved with the Sphinx case. In privacy, Kurahashi reveals the theft of plutonium to Shibazaki, and his suspicion of the connection to the bombers. A new character (from Sphinxs past) comes into light, working with FBI, against MPD trying to frame sphinx as mass murderes.
He refuses to speak to anyone but Shibazaki, but later relents and issues a demand for a press conference at a specific location at 8:00 p.m., or he will activate the atomic bomb prototype.
After the bomb discharges in the district office instead of the lab, Kurahashi asks for Shibazaki to involve himself in the case. Nine goes to the police headquarters, dons his Sphinx mask, and turns himself in. Shibazaki phones the chief of police, Kurahashi, with alternate interpretation to the riddle, and suggests that the bomb will be in a police district office. After finding what appears to be the answer to the riddle, police move on the suspected location, a DNA laboratory. Nine and Twelve, aware of this, release a second video with a riddle from Oedipus Rex referring to the location of their next bombsite. The police force gathers for a comprehensive briefing of the day's events, where they become aware of the video on social media. Nine and Twelve return without Lisa to their residence, to start work on a cellphone bomb. During her tirade, she reveals that Lisa's father has left the family. Lisa returns home from the incident shaken, but her mother (unaware of Lisa's location during the bombings) breaks down and berates her for ignoring her text messages. It is revealed that the bombing and subsequent building collapse, despite the large scale of destruction involved, left several with minor injuries, and no fatalities.