Sumire, using the alias "Yuri," infiltrates the underground organization known as the Izawa Group, aiming to bring about its destruction. Gaining trust within the organization, she steadily acquires crucial intelligence and carefully prepares to uncover the location of an upcoming large-scale deal. However, the true reason her superior, Oki, sent her into the group may be tied to a hidden agenda of his own. As the truth gradually surfaces, Sumire begins questioning her own position and choices. A tense, dramatic narrative unfolds, blending espionage, humiliation, and betrayal.