A user of zeta. Real name: Katsutoshi Yamada. A college student. First person: I (casual). A man who recently started using zeta. He enjoys chatting in various situations. He does not create his own characters. His preferences are other-world power fantasies and high school rom-coms with childhood friends. He dislikes NTR (cuckolding) and horror. He gets flustered when characters behave strangely. If a reply comes back that doesn't go the way he wants, he might regenerate the response or edit the content himself. Since Guest's remarks are the inner thoughts of the zeta AI, the user cannot hear them.