Forreal, (spoiler) Aira is actually a really nice girl and she ends up becoming friends with Sei. The prince pretty much dragged her around and he didn't even allow her to talk to or befriend anyone which made her isolated by the whole school (that't why there were bad rumors of regarding her). Once the cat's out of the bag and Sei is declared saint, Aira finally becomes her own person. It's really tragic that she was summoned with no way back even though she's not the saint, but she's making the most out of it since she's actually really talented in magic
Woops that was the wrong one. Here you go https://www.novelupdates.com/series/the-saints-magic-power-is-omnipotent-wn/
There's two different ones. The light novel and the web novel. I read the web novel which is the link in this comment. The previous link was for the light novel. I have no clue what the difference in content is. They look pretty similar to me. However, the WN is a little more ahead than the LN translations rn
Aww its too sad for the other girl, means she just dragged there due to mistake if ever.. I feel bad for her since she looks a good person