Oura-san is a beautiful dental assistant who is popular with shotas who hate going to the dentist. Shotas who are anxious may become violent during treatment, and may later develop fatal trauma towards the dentist. To prevent this, Oura-san gives shotas who are about to undergo treatment a "charm" that stimulates their genitals, or a "reward" in the form of creampie sex, to help them overcome their anxiety.