Natsume (なつめ, Natsume) is a young and naïve Twin Blade that joins Kite's party when he gives her the Spiral Edge she was searching for. Normally a shy and socially awkward girl, she started playing The World because she wanted to change. Natsume is a Twin Blade with green hair and a blue one-piece outfit. Her dress is adorned with triangular patterns; blue symbols (the same one that appear on Kite's hat) appear on her gloves and in the form of tattoos on her legs. According to the official .hack JP website, her chosen waves are Fire and Wood. She uses a character Model similar to that of A-20. Although she is naive, she does make up for it with energy and a positive outlook. This is a great contrast to her rather pessimistic e-mails. Her e-mails show that she doesn't think much of her abilities; but regardless of what she thinks, she gives it her all when battling in The World. She is actually more skilled than she gives herself credit for; in her quest to become stronger, she followed a hoax and successfully traversed to the bottom of a high-level dungeon solo before she had to be rescued by Kite. Natsume is a girl in the 9th grade, in her last year of middle school. She lacks self-confidence and dislikes athletic activities. She sometimes gets sick the day before she has to run track. She also works as a librarian and is a decent cook, especially when it comes to beef dishes. Her mother's name is Yayoi. She knows Kite's player in real life and invites him over for some beef stew in an email in Mutation. Natsume is a fan of science fiction novels and popular book titles such as the Lord of the Rings trilogy.

.Hack Series
A young wavemaster, only known by the alias of Tsukasa, wakes up in an MMORPG called The World, with slight amnesia. He does not know what he has previously done before he woke up. In The World, he is suspected to be a hacker of the Crimson Knights, as he was seen accompanying a tweaked character in the form of a cat. Unable to log out from the game, he wanders around looking for answers, avoiding the knights and other players he meets along the way. As Tsukasa explores The World, he stumbles upon a magical item that takes the form of a "guardian," which promises him protection from all harm. Subaru, the leader of the Crimson Knights, along with several other players who became acquainted with Tsukasa, set out to investigate why Tsukasa is unable to log out, and attempt to get to the bottom of the problem before it gets out of hand. [Written by MAL Rewrite]