Folks, if I fly an NH-operated flight as a UA codeshare, is it possible to check-in online through UA.bomb?

Somehow, I don't think that I would be able to check-in online through ANA's website, but perhaps I'm wrong about that.

By the way, would anyone know if there is a downtown check-in service for either ANA or UA offered in Tokyo? There probably isn't, but I just thought I'd ask.