Schoolgirls become targets of a perverted doctor who takes a special interest in their nipples during routine health checkups. While mentally telling themselves they shouldn't feel anything during the examination, their bodies involuntarily twitch and react. A strange, ticklish sensation—something they've never felt before—begins to feel surprisingly pleasant. Gradually, the stimulation stirs an aching desire within them, and despite knowing it's wrong, they start to feel pleasure. Under the guise of a pure medical examination, these girls are drawn into an entirely new, forbidden experience.