uhm, thats it? if sex doesnt work, why does unwillingly stabbing the black hair guy works??? and why did the blondie suddenly turn into a yandere?? -_-
http://www.mangago.zone/read-manga/last_seven_days/mpn/mpn_chapter-1999762/20/ According to this, sex isn't actually a sin but rather a misinterpretation that humanity made when reading scriptures (i.e. bible) so in actuality it's okay to have sex haha
what if the female lead is ugly or avg? what would happen then
You already answered yourself. She is the female lead. It doesnt matter if she is ugly or average. Good things will come to her eventually.