Chapter 2 Computer Worm It’s difficult to explain the eeriness of an intercom echoing in the dead of night to someone who’s never experienced it. You’re relaxing, defenseless, in a completely silent room. Suddenly, the silence is broken by an inorganic sound notifying you of a visitor. For a moment, your thoughts halt. You check the clock, and indeed, it’s clearly no time for a person to be visiting. Your head fills with questions and doubts. Who? Why now? For what purpose? Did I lock the door? What about the chain lock? You hold in your breath, listening for the person beyond the door to enter. How much time has passed? It could be seconds, it could be minutes. You timidly go to the front door and look through the peephole, and a mysterious stranger appears and leaves without leaving any hints. It ends with everything still up the air, and the echo of that ill- omened electronic noise continues for the rest of the night… It was a visit without any forewarning. At the time the intercom rang out, Kousaka was cleaning his computer keyboard. The PFU-made keyboard had no markings on the tops of the keys, and not from being rubbed away by repeated cleaning, but because it was designed that way. He’d taken out and washed all the keys just last week,