Obanai was always abused and by his family. His family forcefully cut his mouth from its corners to his ears to make it appear more like that of a snake, leaving a large wound so he keeps it hidden under white bandages. One day he finally managed to escape into night. As he ran, a Demon began to pursue him, almost catching up to him and killing him before the Flame Hashira, Shinjuro Rengoku, came to his rescue. He took Obanai back to his house to stay and that when Obanai met all of his kids.