Wooden Netsuke (strap) of Ichinen-Butsuma (Buddha-Demon) It's a fairly large size, so it's recommended to attach it to a bag! What is Ichinen-Butsuma? Buddha and demon are two sides of the same coin, and Buddha and demon exist only in a single thought. When you think good thoughts, your heart is a Buddha, and when you think evil thoughts, your heart is a demon. It means that people can become good or evil depending on how they think.