Ukyo Kuonji (Ranma) and
Alice Kuonji (Type-Moon character).
Please ignore the brutalization of Alice's story.
The story began with a glance. The man, his name being unimportant, spied her when she walked briskly out of a high-class all girls' school. It was love at first sight - or perhaps it would be better to class it as obsession.
Using his family branch of martial arts (or rather, ninjutsu) he was able to follow her despite her almost inhuman perception (something he noted when she almost spotted him). Strangely, his family heirloom seems to react oddly when he crosses the threshold of her home.
He doesn't actually meet her face to face for at least three months, watching her and seeing how... unfriendly she is to almost everyone. When he does, he appears suddenly, but he doesn't bother to hide the fact that he's been stalking her, assuming (correctly) that she had been aware of it.
Bluntly, she declares, "If you fall in love with me, you will suffer for it."
Not caring, or perhaps not comprehending in his obsession, he states that it doesn't matter.
Their relationship began in that unusual way. He was a mere seventeen-year-old while she was barely fifteen at the time. Later, he learned, that she was the sole heir to a tycoon empire, although it didn't come as much of a surprise considering the place of her education.
Despite his attempts at wooing her, he never truly accomplished grasping at her heart, even after she bore him a daughter a year later. Soon after however, he became aware of a fact about his lover:
Designated to be Sealed.
Strangely, the man wasn't upset by this, having come to accept that something as such would happen. In the end, he decided to have their child grown up without such influences as the Association and her inheritance. She had no objections, but her confession to him before he left was a shock.
"I... have come to care for you. You should tread lightly."
A witch must not fall in love with the male that becomes the father. The more they love each other, the sadder the conclusion.
The man was shocked by her parting words of affection, as he had long given up having her come to love him in any regard. Warmed, yet also chilled by fate that would likely await him, he left.
Six years later, he found his end in a wasting sickness. Having long expected this, yet not really prepared for it, the man quickly directed his offspring's future by engaging her to a traveling martial artist's child and gave a (paltry) dowry to seal the deal, citing only that the martial artist take his daughter with him on his journey.
Unfortunately, the martial artist was a rogue, and took the dowry without the daughter. However, seeing the sad, yet angry eyes his child held, the man set her on to the path of hunting her wayward fiancÚe. Telling her not to return until she had take the boy's life, or his virtue, the man promptly died a week later.
A matter of years after that, the daughter (who's name, if you couldn't guess, is Ukyo) had found her childhood friend turned fiancÚe and was in the middle of courting him - to a degree.
All was fairly stable, until a certain red-haired magician came into town...
Oh, and for reference, the kanji IS the same. ^^