I think I'd actually be somewhat interested in seeing this story be expanded on some more. Maybe something along the lines of the 'god' giving that Heroine 'knowledge of the future' in the form of her meta knowledge also giving Iria 'knowledge of the past' in the form of a library of magic. I think it would be really nice to see a Female Lead actually holding no romantic feelings for others and instead trying to look after them.
I think such a perspective could be really interesting, most people who get as strong as she seems to be are either strong from the start, or a reincarnate who understood the need for strength from the start. I wonder what Iria's reason for growing so strong was, since she apparently worked extremely hard to get to where she is. What is the goal that made her start learning? Was she given knowledge of a threat? Was she attacked when young and weak? Is she a magical musclehead who just really enjoys working out her magic power and learning new spells?
As it is I'd say that the story itself is lacking, it has no real background for her strength which is an issue because she seems to be the personification of 'mercy is the right of the strong' and is taking full advantage of it. But if this was extended a bit, if we learned a bit more about her reasons, I'd love to see her taking the world by storm after she's freed from the restraints of that toxic relationship.