That's not true. I live on the surface with my brothers. They're all oni. They're adopted and they enjoy rushing into small peasant villages, raping the women, and then eating all the men and children. Whenever too much blood and chunks of feces from their victims intestines cakes onto their clubs, they make me burn it off.
The real reason I can't draw mango is because I'm dead and manifested as a hitodama. I have no hands, but it's all right because I'm all blue and glowy.