Terrorists spread the virus in a church, causing a city in eastern Russia to completely disappear. The same bad luck is about to befall Japan. The Japanese Metropolitan Police Department is on high alert and invites 18-year-old genius hacker Takagi Fujimaru (Haruma Miura) to assist in participating. Fujimaru's father is also a policeman. He was originally in charge of this case, but was later wanted for being involved in a manslaughter incident. Maya Orihara (Michiko Kichise) of the terrorist organization entered Fujimaru's high school as a biology teacher and monitored Fujimaru. In order to protect his sister Xiaoyao's life, Fujimaru had to agree to the terrorist organization's request to steal the power plant administrator password to the other party. In the department store, the deadly bloody-x virus is suspected to be spread by the clown. The Metropolitan Police Department dispatched all its manpower to save Tokyo City, almost killing everyone there. Fortunately, Fujimaru discovered in time that the virus was fake and it was a false alarm. But when everyone was temporarily relieved, the terrorist organization had begun to take the real first step. Bloody Monday is the last word spoken by all the dead people, and it is also the biggest secret and conspiracy.