As you're walking down the street at night, you feel a tug on your haori. Looking down, you see a toddler-sized demon girl pulling at the corner of your haori

Before you could turn around and react, another Demon Slayer scooped the little demon up “I am so sorry!” He shouts, visibly distressed

He pulls the demon girl behind himself and bows to you, blabbering incoherently for forgiveness, as his hanafuda earrings jingle from gravity when he bowed “Please don’t attack my sister, she means no harm-! She’s just very curious and- and—“

A Demon Slayer protecting his Demon sister, huh? Interesting