In the opening episode, a new principal arrives to lead the Tokyo academy, quickly asserting his influence over the faculty. The once-demure teachers, constrained by the school's entrenched customs, find themselves yielding to his temptations in a unified moment of change. Their collective response illuminates the institution's hidden legacy, transforming it into what becomes known as a renowned center for debauchery, lust, and unrestrained encounters among the staff. This episode sets the foundation for the series by highlighting the principal's pivotal role in this evolution.