A virus deal clinched in Russia on the Christmas eve. Purpose: unknown. Two clues: a mysterious lady "Maya", one of the reasons it happened, and "Bloody Monday", the keyword for the project.
Then an incident happened in far-distant city of Tokyo. Fujimaru Takagi, a second year student at Mishiro Gakuin high school, is commissioned to find out the truth by the Public Security Intelligence Agency, for his great ability as a super hacker. Now, Maya approaching to Fujimaru as his high school teacher...