In an alternate version of the present, Tokyo has been decimated by a shocking terrorist attack, and the only hint to the identity of the culprit is a bizarre video uploaded to the internet. The police, baffled by this cryptic clue, are powerless to stop the paranoia spreading across the population. While the world searches for a criminal mastermind to blame for this tragedy, two mysterious children - children who shouldn't even exist - masterfully carry out their heinous plan. Cursed to walk through this world with the names Nine and Twelve, the two combine to form "Sphinx," a clandestine entity determine to wake the people from their slumber - and pull the trigger on this world.
Episode 1
Lisa Mishima is having problems at school and at home when two mysterious boys transfer to her school, and she is caught up in a terrorist attack.
Episode 2
While the police work hard to analyze Sphinx's first attack, Sphinx uploads a new video. Will they solve the new riddle in time?
Episode 3
Shibazaki joins the team working on the Sphinx Case while Sphinx tries to confirm suspicions of their own with their next riddle.
Episode 4
In response to earlier provocation, Shibazaki is challenged with a riddle this time only he can solve in order to stop the bomb from blasting but at one condition, no one can cheat.
Episode 5
As Lisa recuperates at Nine and Twelve's place, Sphinx sets another bomb and posts another riddle, but things don't go as planned this time.
Episode 6
Five takes over the battle of wits against Nine and Twelve as Lisa tries to find her place in their group, but Shibazaki isn't happy sitting by idly.
Episode 7
The game is on at the airport and lives are at stake as Shibazaki and his team stumble into the middle of Nine and Five's dangerous game of chess.
Episode 8
After the incident at the airport, Nine and Twelve are forced to abandon their hideout, and Shibazaki is suspended but keeps searching for the truth.
Episode 9
Twelve goes off to save Lisa while Shibazaki and Hamura learn more about the Athena Plan and the Rising Peace Academy.
Episode 10
Things come to a head as Nine and Twelve go their separate ways and Shibazaki talks to Mamiya, the man behind the Athena Plan.
Episode 11
Tokyo is in a state of emergency as the country readies itself for the atomic bomb explosion. Will the mystery of Sphinx finally be solved?
