Hack/cell

Average high-school student Midori Shinomura falls mysteriously ill. While she wastes away in a hospital, she learns of another Midori - a fighter of terrible skill in the online game known as The World. There is a strange and close connection between both Midori Shinomura and game-Midori. With the sanity of both girls on the line, game-Midori will try to solve the mysteries of her past, and perhaps save the real-world Midori in the process.