Top student Emiko was summoned one day by her boyfriend Shinji, who had been caught smoking and asked her to join him in apologizing. Waiting in an empty classroom after school, she was shocked to see her teacher—but obeyed Shinji's instructions. However, the teacher suddenly grabbed Emiko and began roughly groping her body. Shinji had sold Emiko to the teacher as a condition to avoid punishment for his own smoking. Though initially repulsed by the act, Emiko gradually felt her body responding, and deep within her heart, a new, forbidden emotion began to awaken.