Clannad, but you must watch After Story. That is where the romance really gets going, including some heart wrenching drama. It's precisely what you are looking for
Will 2nd Rumbling Hearts, one of the best mature seinen romances I've ever seen
If you are not too offput by incestual themes (you dont have to support it), Koi Kaze is a masterpiece in itself. It builds on the subject in a neutral way and demonstrates one of the best romance's ive watched.
Additionally,
Have you watched Full Metal Panic: The Second Raid? That is where the romance/drama really unwinds and flourishes
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