I've read Rain's Head before and seeing how Yomai keeps suffering, I can't help but dread every new chapter
Going by how mangaka previous works are either tragedy or bittersweet, no magic happy ending, I wonder where this will go in the long run, I doubt people will just accept Yomai after a while even if she saves the entire city or something, hell they'll probably blame her for whatever happens, plus the Japanese at that time were xenophobic as fuck, hell, they can still be xenophobic as fuck today, so I can only see her leaving eventually.
Prediction, in the end Yomai will leave for a better place and Rin will follow, maybe to avoid arranged marriange? This is supposedly a yuri after all