She lost her eyesight due to an exploding transport truck at the age of four. Her mother was killed in the process. For the next five years, Shizuku was hospitalised at St. Ursula Medical College in an attempt to return her eyesight.
Despite her own challenges, Shizuku never stops worrying about her father. While she stayed at the hospital, she befriended KeA and opened her heart to her.
When KeA became the Sept-Terrion of Zero, she used her power to recover Shizuku's eyesight. However, Shizuku's joy was short-lived as her concern for KeA continued to grow.
Her feelings were further conflicted by her father's support of the Crois family's plans that she ended up supporting the Special Support Section against her father.
During the ending of Ao no Kiseki, Shizuku, now 12 years old, is seen at the centre of the group picture taken after the Liberation of Crossbell in S.1207.