Super-popular beauty (sadistic pervert with a lip fetish) x sensitive, socially anxious nobody (gloomy loner)
The school's super-popular beauty is an extreme lip fetishist and a sadist. The gloomy loner in her class is an otaku who always wears a mask. By chance, the beauty sees her:
Holy crap, those are the beautiful lips I've always dreamed of!
Then she turns into a lovesick stalker, and so on...
Little scene: When it happens:
The gloomy loner is so scared of being seen by the social butterfly that she's about to cry. But the beauty is even more excited when she sees her, stammers out "You're amazing," and then kisses her by force on the spot. Yep.
Message: Study hard