At the prestigious Corondo Girls’ Academy, where refined young ladies receive an education hampered by outdated methods, a new instructor named Kobayashi arrives to fulfill the requirements of national law. Tasked with delivering proper sexual knowledge and techniques, he begins his first sessions by introducing modern guidance to the naive students. What starts as official instruction soon reveals a more personal approach, as Kobayashi uses his authority to draw the inexperienced girls into intimate encounters one by one.