Any horror romances where terrible things happen to the male/female leads, but has a happy ending where they are together?

Sailor Moon, Boys over flowers, Dr. Slump Arale chan, Urotsukidoji, Guy 1-2, 🤣 🤣 Ninja scroll...shall I go on? I got 300 more...

Oneshot:
In the Mirror of Death
Zenyasai Patroller
Shoujo horror/romance anthologies:
Zekkyou Gakkyuu (especially ch 34/35 and maybe ch 3.3)
Shoujotachi no Kaidan
Gakkou de Atta Kowai Hanashi
Completed Manga: (might not fit your requirements)
Forest of Drizzling Rain (and play the game 😉 )
Dokuhime
Revenge Game
Unfinished Manga: (still worth a try)
Shinrei Tantei Yakumo
Satsuriku no Tenshi
Tenchi Shinmei!

Furthermore I would recommend you to read Corpse Party - Blood Covered
(or even better to play the game) for a real haunted location
because most of the manga mentioned above do not really take place in one.
Hope I could help. 🙂

Quote from Tsubaki

Oneshot:
In the Mirror of Death
Zenyasai Patroller
Shoujo horror/romance anthologies:
Zekkyou Gakkyuu (especially ch 34/35 and maybe ch 3.3)
Shoujotachi no Kaidan
Gakkou de Atta Kowai Hanashi
Completed Manga: (might not fit your requirements)
Forest of Drizzling Rain (and play the game 😉 )
Dokuhim ...

I'll check them out, thanks.

Though Revenge Game didn't end well at all.

bump

American Ghost Jack
Yuureitou (not really a male/female lead, it's rather complicated. But it is a romance).
And you might try the shoujo version of Shinrei Tantei Yakumo, which is completed but rather light on the romance.