Nagareboshi

Female leads in both have terrible brothers who repeatedly mistreat them.
Female leads are both poor and in need of money, and work in sexualizing fields. Male leads eventually pay them themselves.
Male leads begin engaged to second female leads in both.

- similar amounts of angst and melodrama
- same type of slow burn romance with age gap
- two leads who are really good human beings in their own ways
- both have terminal illness plot line where requires someone sacrifices and gives their organ to save someone else's life