Lol, i don't understand the concept. The mc should be more popular than the male leads because he has such a unique appearance. I don't think the male leads are any special than any other mob characters tbh. This manga is the perfect example that if you have confidence, your whole image changes because of one simple quality and that is, confidence. Kou is the one who can be called popular, lol
Hanamaru Inkya na ga Futago Boku ni Aisareru Iyau