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Tsuboi Ryoutarou

Klein Personal Information Media First Appearance Klein (クライン, Kurain) is one of the 10,000 players who were trapped in «Sword Art Online» and the guild leader of «Fuurinkazan» (風林火山, Fūrinkazan), one of the clearer guilds. He became Kirito's friend after he asked Kirito to show him how to play Sword Art Online. He later began playing ALfheim Online as a Salamander. His real name is Tsuboi Ryoutarou (壷井遼太郎, Tsuboi Ryōtarō).