Okusama ga Seito Kaichou! S02E11 - The Vice President and Treasurer Make Some Kind of Progress

While walking to school, Hayato notices Karin's hair style has changed, and later notices she forgot to put her panties on. Hayato tries to help Karin, only for her to push him away, and when she walks past an open window, her skirt flips up from the wind, a moment which Honoka captures on film.