In an alternate iteration of the present, Tokyo has been hit by a terrorist attack that has devastated the city, with the only evidence of the culprits being a confusing video uploaded to the internet, which only spreads paranoia throughout Japan. Unbeknownst to the authorities is that the terrorist masterminds who call themselves "Sphinx" (スピンクス Supinkusu) are two teenaged boys, who go by the names Nine and Twelve, who apparently should not exist and have decided to wake up the world with their heinous plans of death and destruction with their fingers on the trigger.