Once again we focus on Nami Matsushima. This time she has a sister who goes missing and after getting too caught up in doing something about it, our innocent heroine is given a fifteen year sentence for a murder she didn't commit. She's sent to an all women prison where she's not exactly welcome. Her fellow inmates torture, humiliate and try to kill her; but the Scorpion prevails long enough to get some justice.

A nurse is framed for her involvement in the hospital murder of a politician who was threatening to expose corrupt practices. She escapes from jail but is captured and sent back, resulting in the rest of the inmates being punished, added to which of a new, tougher, head of security arrives to take up her new job....