No premiere date announced yet. The new PV is here. For more information, check out the Crunchyroll article. Synopsis from AniList:
Matthew is just another parasite in the chaotic dungeon city of Gray Neighbor. People say he’s a lazy weakling who gambles and drinks away all the money he gets from his keeper, princess knight Arwin. But the truth is, no one in this town knows what he’s really like—a ruthless protector who works in the shadows and will do whatever it takes for the sake of his mistress.
That’s a shame, I was interested based off the image alone. Using her hair for the red thread of fate is pretty neat.
I feel like it’s been done before, but maybe not so blatantly?
I want to say you’re right, but there’s a certain shtick involved in the leads’ relationship I just couldn’t get past. It never goes much further.