Huuuh that’s an interesting question. I’m gonna take this question as what their main conflict and resolution would be like.
In this au, the reason Rinne doesnt want to go back home is because he realizes that even if he did become a good lawyer who can represent his village, going back won’t do them any good because right now, the system as it is is stacked against their favor. And so, he finds it better to stay and figure out how to make changes from there. This is something that Hiiro has to understand: the law in the end was written by humans, and humans’ perception of justice is subjective. There is no black and white.
I had a thought of Hiiro actually being arrested and Rinne has to defend him. Hiiro, though, believes he’s guilty because the evidence points to him, but Rinne knows he’s been set up.