Sizuku MacLaine (シズク・マクレイン,Shizuku Makurein?) is the only daughter of the Wind Swordsmaster, Arios Maclaine. Due to an accident that resulted to losing her eyesight, she resides inside the Ursula Hospital for a long term. Sizuku and KeA became close friends after encountering each other in the hospital. During the events of Zero no Kiseki, a medical surgery was being prepared to recover her eyesight under her new doctor.
Near the end of Ao no Kiseki, Shizuku successfully recovers her eyesight due to a combination of the surgery and KeA using her powers to repair her nervous system.