Shione

Yune's older sister.

[Spoiler] Shione took care of Yune while Yune was very sick. People always avoided her because of her bright blue eyes, only Yune said her eyes were beautiful and her sister only needed to look at Yune. Thereafter they pretended that Shione had gone blind. But unfortunately she really went blind due to illness. Yune blames herself for making her sister sick and taking her strength. [/Spoiler]