The Lonely Boat Carrying the Autumn Moon (Original Fate Has Come, Have You Turned Around?)

That's the summary: a woman travels through time and falls in love with a male pig. Later he came back, but the male pig didn't come. Went back again and brought the male pig back. (Actually, just by looking at the name, you can tell that you're not that novice!) Ps: It's bloody, please be careful if you don't like it!