Erica thinking about the possibility of a love rival feels pretty remote when, formally, she and Harold are supposed to hate each other and, even worse, ignore each other.
It’s not really that he couldn’t foresee it. More so that it’s not something he considered at all. It’s not like he needs to constantly avoid main characters.
She's gonna fall in love with our mc isn't she , and here I was hopeing that our mc would have just 1 wife and the other girl would fall In love with the mc of the game not the manga