Avalon (Japanese: アヴァロン, Hepburn: Avaron), also known as Gate to Avalon, is a 2001 Polish-language Japanese science fiction drama film directed by Mamoru Oshii and written by Kazunori Itō. Synopsis: A player in an illegal virtual reality video game has her sense of reality is challenged as she attempts to unravel the true nature and purpose of the game.

References:
https://en.wikipedia.org/wiki/Avalon_(2001_film)