You don't even have to be a hot girl to want to look good. Everyone wants to look good. It's a shame that more young men aren't taught the value of personal grooming and working on their appearance to achieve that.
"Me...getting cucked by the guy who's supposed to cuck Yuu-kun!?"
Now that I've read this line, I'm praying to the horrid, degenerate powers that be that she does end up being the one who gets cucked.
Lol, Rua wants to force the MC to show her respect or else the school will punish him. The exchange with the student council president is to show that the MC absolutely refuses to let his school performance suffer, so Rua is about to rake him over the coals.
Kinda reminds me of those social deduction games where that one role wins if they achieve their goal regardless of what happens to everyone else. We've got a bonafide executioner MC on our hands.