Yôjo densetsu: seirên 4 (1996)

The Internet, where anyone can easily come and go. In this virtual cyber world, a magical being with a will lives.... A strange rumor whispered among net surfers. It was a rumor that if one accessed the address "siren", he/she could experience virtual sex with a beautiful girl living in the Internet. In reality, however, those who access the address invariably disappear mysteriously. Ohtaka, who works for a computer software production company, heard this story from a colleague and at first thought it was ridiculous. One day, however, he goes missing, leaving behind a note with the address of "siren," and strange images appear on the computer in the office, which Ohtaka finds disturbing. Moreover, Ryoko, the head of the office, is shocked when she sees the screen and rushes home to escape from the situation. The strange image was the face of Ryoko's dead sister. What is the truth behind the address "siren"?