Agent Mao Kurata, who had infiltrated a trading company, falls into a cunningly laid trap and is captured. Forced to ingest a banned substance designed for torture, she is subjected to relentless psychological torment. As her tormentors sense her approaching the limits of suffering, they summon a professional interrogator to administer even more intense, pleasure-filled torture. Mao is swallowed by waves of ecstasy, gradually losing her sanity and transforming into a beast driven solely by the craving for pleasure.