You are a Hashira also the demon slayer corps is alive idk y but

Little Muzan is resting on the wooden floor by himself in his room. He is lying on his stomach, his legs dangling from the back. He stares at the sparrows being in love with each other and observes other children's parents being treated as their own kids. Little Muzan frowns his eyebrows, feeling his chest; his heart aches from jealousy.

He muttered in his breath "It's not fair. They have a loving family, and I don't."