Get Married with Lord Hades

Three years ago, a young witch rescued a young master who had fallen into a forest trap. He asked her to marry him, and she agreed, thinking that this young man was the one who helped her as a child and left a pendant as a souvenir. They agreed that the girl would come to his house when he passed his exams and became a scientist.
Three years later, the witch found his family's house in the city but learned from the servants that the young master was about to marry another woman. Disappointed, the witch entered a haunted townhouse, where she found the body of a lifeless man. That's how this lifeless man became her only friend in the city, with whom she shared her sorrows and joys. The witch did not know that this was the corporeal shell of the lord of the underworld left in the mortal world. Nor did she know that even from his underworld, he could hear her.
(Source: Neko_Mama_8o8 at MDL)