At a specialized clinic in Tokyo, beautiful doctor Yuna treats male patients who are anal masochists by fitting them with custom harnesses designed to unlock intense pleasure. Using a variety of techniques such as "Sensual Therapy Penivibe," "Penivibe Rounds," "Dominatrix Penivibe," and "Linked Penivibe Threesome," she carefully develops each patient's anal sensitivity. Through this process, she draws out their desire, deeply probing and relentlessly thrusting with a penetrating hip motion in intense penivibe fisting treatments. Tailoring her approach to each patient's condition, she also performs precise, deep anal training with skillful thrusting motions that reach far inside their rectums. The anal hunt by the penivibe-wielding female doctor unfolds across four full episodes.