A Maiden Praying

Margaret woke up one day to discover she had been forced to bind herself to a System called the "Saintess Rescue Plan." The System also told her she was already dead, and that she could only stay alive by gaining people's faith. Well, fine. Even if that condition sounded completely unreliable, at least there was still some hope of staying alive, right? But can someone explain what these two templates are about? Two girls with identical faces, differing only in hair and eye color, stood before her in matching suits of armor, one black and one white. [We have to save the world, so of course we have to become both the saintess of light and the saintess of darkness!] ...Well, that does make sense, doesn't it? [Then how do you explain this adult dragon whose attributes might be light or dark? I'd appreciate an explanation.] [...Well, isn't a dragon knight an essential companion for a saintess?] Other people's dragon knights are knights who ride dragons, not dragons who become knights! Essential item, male lead, dragon knight: Actually... Saintess, I could keep your bed warm, too (blushing). Blushing my ass! I just want to pray that I'll survive today, waaaah QAQ P.S. An unserious Western fantasy, goofy romance