Saeko Matsushita's daily life takes a sudden turn when Hayato, her husband's childhood friend whom she affectionately calls "big brother," starts visiting their home three times a week. She begins to sense something hidden behind his actions, eventually discovering that his true feelings are for her. Unaware of the tension, Saeko innocently asks, "Do you have a girlfriend...?"—propelling the story into uncharted territory. What will become of their relationship? From Attackers' Super Special label, featuring the big-titted married woman Saeko Matsushita.