The Doomed Groom

Okay so... I was laying in bed one night, not able to sleep, when I thought of this... Idea... An Idea... For a "Corpse Bride" inspired Prussia x reader. And this was born!
It's been ten years since the event occurred. Everyone in town knew the story of the doomed groom, the tragic tale of a young groom stabbed on his wedding day, but no one knew who did it or what happened to his corpse. It was the kind of story that somehow slithered its way into every conversation, no matter if it is about the weather or the price of a dress. When Lord and Lady L/N fall into debt after they invest in a stupid business venture, they are "forced" to marry off their only child Y/N to the very rich Ivan Braginsky. Y/N, in an act of defiance to her parents, refuses to learn her vows. But with the date of the wedding fast approaching, and no sign of it being cancelled altogether, an unhappy marriage seems to be a guaranteed part of Y/N's future... That is... until a heated walk into the woods after a disastrous wedding rehearsal leads Y/N to finding, and accidentally marrying, the mostly preserved corpse of the doomed groom. Still mentally and physically the age he was, the doomed groom, also known as Gilbert, has no memory of who killed him. Which is a problem because he has to find and kill his murderer in order to regain his life. Oh, and one more thing... If Y/N doesn't help him find the killer in two weeks, both she and Gilbert will forever be condemned to be tortured souls. Will the unlikely couple find the killer and Gilbert will be restored to his living, breathing, awesome self... Or will they spend the rest of forever floating around in agony? This is the Doomed Groom. I do not own Hetalia or any of the songs I put in this fic except for some songs I changed the lyrics a bit to fit it into the context of the scenes.