Troubled by difficulties both at school and within her family, Lisa Mishima finds her world irrevocably altered by the arrival of two enigmatic new students. Soon, she is drawn into the heart of a terrorist attack.

As the police meticulously dissect Sphinx’s initial assault, the enigmatic entity releases a fresh video. Can they decipher this new enigma before it’s too late?

Shibazaki has joined the team investigating the Sphinx Case, as the enigmatic entity endeavors to validate its own conjectures through a forthcoming riddle.

Having been goaded previously, Shibazaki now faces a riddle, one he alone possesses the key to, the only means of averting the bomb's detonation. The condition, however, is absolute: no deception is permitted.

While Lisa recovers at the residence of Nine and Twelve, Sphinx orchestrates another intricate scheme, deploying a new challenge alongside it. However, this time, the outcome deviates from the anticipated course.

Five found himself in a contest of cleverness against Nine and Twelve, striving for acceptance within their circle. Meanwhile, Shibazaki remained restless, unwilling to remain passive in the unfolding dynamics.

Amidst the bustle of the airport, a high-stakes game unfolds, and lives hang in the balance as Shibazaki and his team inadvertently find themselves caught in the perilous machinations of Nine and Five.

Following the disruption at the airport, Nine and Twelve were compelled to leave their sanctuary. Shibazaki, meanwhile, faced suspension from his duties, yet his pursuit of the truth continued undeterred.

Twelve departs to rescue Lisa, while Shibazaki and Hamura delve deeper into the intricacies of the Athena Plan and the Rising Peace Academy.

The situation escalates as Nine and Twelve part company, and Shibazaki seeks out Mamiya, the architect of the Athena Plan, for a conversation.

A pall of emergency hangs over Tokyo as the nation braces for the impending atomic detonation. Meanwhile, the enigma of the Sphinx may finally yield its secrets.