When a junior investigator fails to infiltrate a dark organization, Sumire is tasked with investigating it. Her public face is that of an S&M queen, and she forces a masochist who knows the whole story of the organization to reveal its hideout. She learns its location and infiltrates it, but is discovered by a member of the organization, a fight breaks out, and she is caught off guard, injected with an aphrodisiac, and restrained.