Saki works at a lingerie manufacturer, where she once looked up to her senior and team leader, Akiho Yoshizawa, aspiring to emulate her skills and dedication. One day, she is suddenly promoted to team leader herself. However, this appointment is actually a trap orchestrated by upper management as a pretext to sexually harass female employees. In this fourth installment of the popular series, a big-breasted, slender office lady faces a shocking situation as she grasps at a chance for advancement by commodifying herself. As the boundaries between work and personal life blur, what choice will she ultimately make?