Yui consults the principal in his office. As a newly appointed female teacher, she notices suspicious financial transactions among students while preparing for the school festival. The amounts involved are unusually high, violating school regulations, and the students claim it's for "event expenses." However, Yui suspects otherwise and reports her concerns to the principal. She soon discovers the chairman's son is involved, and the school administration pressures her to stay silent. Amidst this tension, delinquent boys, schoolgirls, and female teachers become entangled as the festival day approaches. Under the spotlight, the female teacher sheds her tight skirt, casting shadows in the after-school darkness.