This is a bloody story with a time-travel theme.
This is a story told from the perspective of the male protagonist.
I find that no matter how you condense the story, it spoils the story and makes it uninteresting.
Therefore, I can only responsibly tell those who are willing to read it: This is definitely a romance story, and it takes place between a human man and a woman.
A one-sentence introduction can include:
His skeleton traveled through time with the steel nails in his left leg bone and his soul!