A girl isekais (a largely redundant detail) to another world with magic and grows up in a temple. She goes on to become a powerful magic-welding priestess.
On a war expedition she falls in love, but confesses to the wrong person while drunk.
It's a good thing, because the guy she nearly confessed to is an absolute psycho and I hate him with a passion. She's kinda leading on the guy she confessed to though, and I'm not looking forward to the drama that ensues from that airing out. The drama leaves me with a bitter taste in my mouth.
A False Confession