Yuuki Asuna (結城 明日奈, Yūki Asuna?), known as Asuna (アスナ, Asuna?) in «Sword Art Online» (SAO), «ALfheim Online» (ALO), as well as «Project Alicization», where she had temporarily used the Stacia (ステイシア, Suteishia?) account, is the main heroine of the Sword Art Online