Tobias, Mary, and Sakuya are gamers addicted to life in the The World. The role-playing trio's adventures start spilling into the real world after an encounter with a twig-wielding cat known as Hermit.

After an accident inside The World leaves Mary comatose in real life, Tobias and Sakuya search for a way to revive their friend. Meanwhile, the mysterious Hermit gets a dose of very bad news.

The World begins to crumble and players are unable to log out as Hermit goes on a final, deadly rampage. Can Tobias and Sakuya save Mary before it's too late, or will they all be trapped in The World forever?

Special episode for .hack//Quantum, one of three shorts feature the characters of the series as if they are simple purple simulations.

Special episode for .hack//Quantum, one of three shorts feature the characters of the series as if they are simple purple simulations.

Special episode for .hack//Quantum, one of three shorts feature the characters of the series as if they are simple purple simulations.

Special episode for .hack//Quantum, Yui tries to make a charaben food-dish.

Special episode for .hack//Quantum, Yui and a friend learn about the process of animating a series.

Special episode for .hack//Quantum, features Yui Ogura that has Yui "divulging answers" to the Cult Quiz which was included in the packaging of Volume 3 of the .hack BD and DVD releases for the Japanese viewers.