is Kirito's younger cousin in the real world. She's a diligent worker and has been practicing Kendo for 8 years. Kirito/Kazuto calls her "Sugu". After Kazuto got trapped in Sword Art Online, she began playing ALfheim Online in order to understand him better. She develops feelings for Kazuto after she learns that he's not really her brother, but understands that Kazuto's feelings for Asuna are too strong. Coincidentally, she meets Kirito in ALfheim and aids him in searching for Asuna unaware that Kirito is Kazuto. After understanding the depth of Kazuto's love for Asuna she resolves to give up on him and instead becomes attached to Kirito in ALO. Unfortunately, she is heartbroken when she finds Kirito's real world identity in ALO. Nevertheless, she pulls herself together and aids Kirito in rescuing Asuna.