Kasane Shibata

柴田 かさね
Kasane a survivor of the Shishigou incident is Asumis childhood friend. Because of the crash she has a horrible burn mark on her left arm. In the present Kasane goes to an allgirls school. In the manga her first reappearance shows her sleeping in Asumis dorm room which is a few volumes after her reappearance in the anime. Source: Wikipedia