You know, I like Otome Isekai a lot. I'm pretty sure this subgenre has a better quality hit rate than regular ones, I think it's because it almost have to be a deconstruction and almost have to not take itself too seriously. But this has the weakest premise I have seen yet. Weight loss as a part of the mission doesn't have to a weak premise (another isekai that is about weight loss was pretty interesting until they magic the fat out of the heroine), but being both about wanting to lose weight and wanting to avoid becoming the villainess's follower are smooshing two separate stories. Either let it be someone working to lose weight or be someone working to be not be a villainess' cannon fodder.
Still following it.