After Kiyono joins the society, the girls become aware of her habit of teasing what's under her skirt in front of boys. She flips up Yako's skirt and makes fun of the underwear, only to show some embarrassment when she flips hers back. The girls are surprised when Kiyono takes off her underwear before leaving. The next day, a moral exam is held and Kiyono is told off for wearing makeup. In the meeting later that day, Nayu brings a deconstructed bra, but Kiyono shows disinterest. She then insults Mizuno, particularly about her femininity and bra choice, and shows everyone catalogues of more kinky underwear. Kiyono argues with Nayu over looks vs comfort, but feels some embarrassment when the topic of who she loves is brought up.
天原清乃の同好会加入で、不安を隠せない奈由。なぜなら清乃は、小町の前でわざとスカートをたくし上げて退席させたり、弥子に地味と言われたパンツを捨ててノーパンで下校する問題児だったからだ。
同好会の楽しい雰囲気を壊したくない奈由はブラジャーのパーツを教材に、小町でも恥ずかしがらずに参加できる組み立て作業を提案。初めは面倒そうな清乃だったが、話題が下着のデザインやメイクの方法に移り、他の女の子たちと次第に打ち解けていく。
Después de que Kiyono se une a la sociedad, las chicas se dan cuenta de su hábito de burlarse de lo que está debajo de su falda frente a los niños. Levanta la falda de Yako y se burla de la ropa interior, solo para mostrar algo de vergüenza cuando voltea la suya. Las chicas se sorprenden cuando Kiyono se quita la ropa interior antes de irse.
