[samurai007]

To be honest, I never saw anyone wearing a hijab there, so I don't know what the reaction would be. I think you'd likely get a lot of stares and questions (but then, most foreigners do, especially outside the big city). I think you might be mistaken for a nun, since that is probably what some Japanese would assume from a woman covering her head. Since you know anime, you know that nuns are a fairly common sight in it.