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