Oiwa is one of the most famous ghost stories ever written. In Japan it is known as "Yotsuya Kaidan", which tells of a woman who is poisoned by her unfaithful husband.
Thus making himself present as a ghost full of revenge. In the beginning of the story Oiwa is a beautiful girl and lives in all small towns in Japan, her boyfriend named Iemon is not a rich man but Oiwa loves him for who he is.
Oiwa felt very happy when her boyfriend and childhood friend asked her to marry, after their marriage looked very happy and lived together, Oiwa didn't mind if the man she chose wasn't rich, but after some time passed, Oiwa started to get angry and depressed with a lazy attitude and not trying the husband.
This causes the husband Iemon to hate his wife and start looking for another woman named Oume.
They dated for several months without Oiwa knowing, Oume loves Iemon very much even though he knows that he is married.