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Suguha Kirigaya (桐ヶ谷 直葉, Kirigaya Suguha) is a fictional character who appears in the Sword Art Online series of light novels by Reki Kawahara. She is more commonly known as Leafa (リーファ, Rīfa), her player name in the fictional Alfheim Online virtual reality MMORPG in which the novels are partially set. In the real world, Sugua is the cousin and adoptive sister of series protagonist Kazuto (Kirito); after Kirito becomes trapped in the eponymous Sword Art Online video game in the series' first story arc, she starts playing Alfheim Online due to its similar nature to better understand the world in which her brother is imprisoned. After her mother reveals to her that Kazuto is not her biological brother, Suguha starts to develop romantic feelings towards him, though is later saddened after realizing his attachment to Asuna. The character has received mostly positive critical reception, with praise centred on her character development, attractiveness, and portrayal.