Mei, a high school girl who helps her parents run their business, wants to do her best to entertain a guest who has come to her family's inn for the first time in a long time, but she has a secret that she cannot tell anyone. Mei wraps a cloth around her chest so that no one can see her. Her nipples are extremely sensitive, and even the slightest stimulation causes her whole body to convulse. A male guest witnesses this secret ritual, and because of Mei's customer service attitude, he targets her nipples and develops her sexual sensitivity without her parents knowing. As her pink nipples are kneaded and she climaxes over and over again, her body becomes addicted to pleasure...