Koyako, a petite and slender dance instructor at a dance studio, used to be a classical ballet dancer. She conducts her lessons wearing a tight leotard that accentuates her voluptuous, big-titted figure. On this day, she's assigned to give a private lesson to the son of a company president who sponsors the studio. However, the boy is a complete beginner—constantly losing balance, stumbling, and making the session extremely taxing for Koyako. Worse, he deliberately invades her personal space, touching her body and moving in close under the guise of learning. Unaware of his true intentions, Koyako continues the lesson innocently, unaware of the sensual game about to unfold.