Who in their right mind would marry Akari with how she abuses her power?
What guarantee would she be able to give to the people, the nobility, and the king that she won't do the same to them?
She may have the holy power, but the way I see it there's too many strings attached to it, assuming she listens at all.
Here's hoping the sequel's heroine, who is undoubtedly going to be isekai'd, has more than two brain cells to rub together and the temperament of a saint.