1x5 - dot hack Legend of the Twilight

A group of hackers set a trap for Shugo to try to get rid of him. Unfortunately Rena is caught in this trap and her player character disappears after becoming a ghost. Meanwhile Balmung is confronted by Kamui of the Cerulean Knights. At the end after Rena's terminal is shown as vacant, you can hear her phone's ringtone play the theme to the .Hack//SIGN anime.