The 2009 film Assault Girls, which was written and directed by Oshii, is a stand-alone sequel set in the same fictional universe as Avalon.

Winners are rewarded with experience points and in-game money, which can be exchanged for cash, allowing skilled players to make a living.

As their brains interact with Avalon directly, it places mental strains on players, and sometimes rendered them catatonic.

After a Class A mission, the GM (Game Master) warns her of the next level's danger, and suggests that she join a party.

Murphy, their former leader, went after a hidden NPC in Avalon, a young girl nicknamed "ghost," and became comatose.

After she overpowers a player, the griefers' leader reveals that only the real Nine Sisters – Avalon's creators – know how to access Special A.

He mentions a high-level Bishop player who can make the ghost appear, and is sought out by parties seeking to enter Special A.

Stunner, Bishop and his summoned dummy players distract the Citadel, while Ash attacks its weak point.

Ash "wakes up" from the game booth, which is put in her apartment, wearing civilian clothing and without equipment.

Ash takes a provided gun and proceeds to her destination, an Avalon-themed concert by the Warsaw Philharmonic Orchestra.

I considered shooting in the UK or Ireland, but the towns and scenery in Poland matched my image for the movie."

The British region-free DVD has literal English subtitles which explain the King Arthur connection better and does not display added dialogue.

However, it mixes elements of role-playing games (such as character classes and experience points) and first-person shooters (FPS) (utilizing real firearms such as semi-auto pistols (Walther PPK and Mauser C96), sniper rifle (Dragunov SVD) and rocket launcher (RPG-7)); and it also borrows from the Wizardry series Oshii played extensively during three years in which he was unemployed in the 1980s.

The design of the headset and chair installation are influenced by the cult French science fiction short film La jetée.

As an interesting first, this film features the appearance of lag, a gameplay error due to network transfer slowdown often encountered in online games.

This scene is based on Oshii's own teenage experience, when he used to spend entire days spinning in loop in the Yamanote Line.