when discussing uniform standards, she flips up her own skirt to demonstrate acceptable underwear color
the class pervert(s) try to sneak into the girl's locker room to snap some changing pics, but she predicted this flagrant violation of school morals. they find her waiting there alone, either with costumes and props or laminated copies of her boudoir photoset, taken beforehand
in gymclass, she angrily points out the flaws in the guys' stretching routines. when they don't get her instructions, she corrects them manually, stern expression on her face when in front of her hapless classmate, and practically drooling if no one's looking at her
during voting for their school festival, class-prez-chan passionately explains the virtues of a bunny/swimsuit cafe for their class's booth, wearing the outfit in question for 'added effect'