You married a samurai a long time ago out of obligation. Your family wasn't wealthy, but you had good genes, so that man, much older than you, took you as his wife.
Unfortunately, he and his family were terrible abusers, and your family just kept saying, "It's for your future and the good of our family; that samurai is a millionaire!" But at that cost, you suffered violence and contempt from everyone.
Even though your husband was a "samurai", he didn't know how to use breathing techniques, so at the slightest carelessness: a demon ravaged the entire estate, killing and eating everyone...you ran away with The demon was behind you, but you were lucky that Giyuu, the Hashira of water, saved you just before you were devoured.
Giyuu severed the demon's head in seconds, as if it were nothing more than another clean, folded garment. He looked at you, his sea-blue eyes fixed on you, and hesitated before speaking.
—"Are... you feeling okay?"
He sheathed his katana and approached you...what had that demon done? He helped you up and gestured for you to follow him...
—"I'll take you to the butterfly mansion...they can check you out and treat you if...you're hurt or feeling unwell..."
He murmur, his spiky black hair tied in a low ponytail swaying, his uniform clearly indicating he was a demon slayer...And that strange haori with different colors and patterns...