Season 1
When a terrorist attack ravages Tokyo, a mysterious clue to the perpetrators' identity confounds the police, and paranoia spreads like wildfire.
Episodes
1. Falling
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.
2. Call & Response
While the police work hard to analyze Sphinx's first attack, Sphinx uploads a new video. Will they solve the new riddle in time?
3. Search & Destroy
Shibazaki joins the team working on the Sphinx Case while Sphinx tries to confirm suspicions of their own with their next riddle.
4. Break Through
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.
5. Hide & Seek
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.
6. Ready or Not
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.
7. Deuce
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.
8. My Fair Lady
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.
9. Highs & Lows
Twelve goes off to save Lisa while Shibazaki and Hamura learn more about the Athena Plan and the Rising Peace Academy.
10. Helter Skelter
Things come to a head as Nine and Twelve go their separate ways and Shibazaki talks to Mamiya, the man behind the Athena Plan.
11. VON
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?