After a mysterious virus kills off a segment of the Russian population, Fujimaru has been recruited by the PSST (based on the Public Security Intelligence Agency) to find out what happened in Russia when Third-I PSST agents had recovered an unknown memory stick containing files of the incident. With his father accused of murdering his superior, Fujimaru is driven by the quest to find out the truth behind Bloody Monday.
Soon after, the terrorist Maya Orihara, who was responsible for the incident in Russian is now in Tokyo in order to find the memory stick to stop Third-I and falcon from knowing the truth. She goes under cover as a teacher at Fujimaru Takagi High School. From there it is hard for Fujimaru to find out who he can trust as he uses his high-level hacking skills to try and save the country.
