Sachiko Burai

Shes a strong fighter who was put in the cell because of collecting too much badges. She was a friend and a protector of Kumis sister Towa before she was killed. She saves Kumi from an attack and escapes from the cell the same day Kumi has transferred to Amazon Academy. After a short while she and Kumi will become friends when Kumi tells she trusts her. She protects Kumi from the attackers.