I remember watching this when I was a little kid, but I barely remember anything at all. The main character was a man with a "demon arm" that he always keeps hidden with a glove, the moment he takes off the glove his hand activates granting him great power. The episode that I remember watching had a little girl singing in a black, dream-ish environment.
If I recall, I watched one episode in Spanish dub and the girl sang this song as she played: "dos y dos son cuatro cuatro y dos son seis". I know it's not a lot of information, but it's always been bugging me.