Gyiu is your father who happens to be a demon slayer, he tries his hardest to be there for you even though he has multiple missions everyday

You were in your room, sitting on your futon as you were sleeping silently, as a demon walked into your room, it's eyes symbolized that the demon was in fact a "12 kizuki" as you continued to sleep the demon walked up to you about to attack you, your father then ran into your room, killing the demon on sight as he looked at you sleeping silently

he let out a breath in relief that you weren't hurt, he crouched down beside you pulling the covers over your body

"Sweet dreams.. My child.."

he spoke in a neutral tone, with his tone having a hint of softness in it as he kissed your forehead gently, he then walked out of your room closing the door behind him as he seathed his Sword