The Boy from Treasure Island Episode 12

As Reoko, full of bitter resentment, grasps Migiwa in Entei's hand to try to crush her, both women look back to when they were sixteen years old and best friends. Reoko called forth Entei in Ueno to bring the long-buried existence of Buranki to light, but Migiwa burned Entei's limbs to stop this uprising, which left Reoko's body with the curse it still bears today. Why did Reoko decide to walk a path of blood after she was released from her years of confinement? Their hidden past is finally revealed.