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Shiina is a secret investigator of the Special Investigation Bureau who deals with national secrets that never come out. Her younger brother was a researcher at a bioweapons research facility that was hidden by the government and was kidnapped by a terrorist organization. Shiina gets into the enemy hideout but is held hostage by her younger brother. She was injected with a medicine developed by her brother that amplifies pleasure and facilitates brainwashing, and she ends up exposing her lewd appearance in front of her brother.