@GabrielH Unfortunately, I'm not sure... all I can say for certain was that it was around during the original anime run of Prince of Tennis, which would peg it as before 2005. I don't think the art style was too antiquated, so it should be at least the late 90s... as far as a name goes, all that comes to mind is Tenshi ni Narumon, which, uh, sure as hell ain't it, but it may have had a few syllables in common.