While sleeping one night, Ryo Utsugi had a nightmare of monsters attacking him. One day he learns a mysterious power to let him hear voices and have visions of girls getting killed, but one night he hears the same voice. (Source: ANN)

Specials bundled with the all the BD/DVD volumes.

In this modern society, a new kind of "illness" is striking young boys and girls. Loneliness, disbelief, and outrage push this generation to grow more and more attached to internet and technologies. The experts call these symptoms "Net Addiction." To cure this condition, a certain rehabilitation facility has been set up to "lead the young men back to the right path." Enrolled to treat his addiction, Hibiki had no idea that this rehabilitation facility is nothing more than a prison. In this hellish place where escape is prohibited, how will Hibiki overcome his despair?

The setting is a parallel world to Fate/stay night where the Greater Grail mysteriously disappeared from Fuyuki after the Third Holy Grail War. After many years of silence, around the same time as the Fifth Holy Grail War would have happened, the Yggdmillennia, a family of magi, openly declares their secession from the Mage's Association, and that they are in possession of the Grail. The Association dispatches fifty magi to retrieve it, and all but one are instantly slaughtered by a mysterious Servant. The one remaining manages to activate the reserve system of the Greater Grail, allowing for the summoning of fourteen Servants in total. In the city of Trifas, two factions will fight for the control of the sacred relic, each of them possessing their own team of seven Servants : the Black Faction whose members are part of Yggdmillennia, protecting the Grail, and the Red Faction whose members were sent by the Mage's Association, trying to take the Grail back. For an event of this scale, the Grail itself summons its own Servant, the holy Ruler, to oversee the conflict.