Criminal psychologist Akira Watase is faced with treating a man who, after his father's death, finds himself unable to control his urges to rape women who resemble his mother. At the request of a client, she heads to the underground dungeon where the man is being held, only to discover an unexpected trap awaiting her. Despite approaching the case with calm analysis and sharp insight, this proves to be a challenge unlike any she has faced before. A gripping work blending intense psychological depth with full-fledged rape and BDSM elements.