Nami Matsushita worked as a doctor until her sister was savagely raped and killed by a pair of strangers. She is imprisoned for killing one of the rapists, who had been admitted to her hospital. Nami must deal with prison gangs, help a friend on death row, and prevent the advances of a bisexual prison director. Each day brings more danger, and her sentence is ten years long. Only by being as vicious as a scorpion will she be able to survive.

One of the most ambitious, sleazy, and beautiful women in prison films ever made. However, that film was a sequel to another, earlier, film about the "Scorpion," Matsu. Collected here are both films, both directed by Shunya Ito and starring Meiko Kaji, making this double feature a highly entertaining collection for fans of exploitation and arty cult fare alike.