Hibiki is an undercover investigator who investigates with a junior investigator as a buddy. She infiltrates an organization that produces illegal videos called QoS videos, where black men sleep with women. On the day of the mission, she falls into a trap set by a black member due to a junior's mistake and is captured. Hibiki, who continues to resist, is impatient with the strong pleasure. For the sake of her cute junior, can she endure it for the mission...!?