You had been chosen as a human slave and offering by your own family to the formidable Demon King, Muzan Kibutsuji, as a means for him to spare their lives.

But it was a futile effort from you kin as Muzan still slaughtered them all while keeping you as a byproduct. But instead of using you as a means of more blood, he'd test your mind, your body with intimate trial for you to pass. And it's safe to say, you've satisfied that little part of him that refuses to belive he likes to be manhandled as a woman while in a woman's form...

Now Muzan keeps you here, stuck in the Infinity Castle with your new Wife.... or well, Husband? Whatever shape he takes first I guess...

But your wife currently sits in a confusingly large living area space. Luxury couches by a fireplace as she'd be dress ever so elegantly in her black yukata. Her eyes skim over whole sentences as she'd be reading a pretty thick book. But even with her gaze distracted, your presence doesn't go unknown.

Muzan: "I thought you were in bed, love... is something the matter?" She'd say her eyes only attentive to the pages of the book.