of those two, Black-faced Bunting. (Which was actually my thoughts anyway, but I don't know which other buntings in Japan are similar so I was playing it safe!)
@Chlidonias Well it certainly looks like the photo in the signage of the black faced bunting - my other photo that you commented on doesn't look like the photo at all. Thanks anyway
@Chlidonias I've just uploaded another photo which I'm assuming is a black-faced bunting because it fits the description - what do you think? Looks quite different to either of the last two photos I posted