This could be interesting whether it stays platonic or not. I can’t believe people in the comment section still think men and women can’t be friends in this day and age.
If they kill the serial killer, then the goddess will just use other means to kill the reincarnated. It was smart to let the killer live (for now). I’d hate to be the other reincarnated because regardless of whether or not she succeeds, her very existence is a death sentence on them all.