I have a feeling that Nikki and Richie are not going too well recently.
She deleted a bunch of Richie fans on her twitter and then claimed that someone hacked her account.
She clearly has been in Japan for a couples of days now and she's not posted a single picture of herself and Richie together.
I don't think she would miss any chance to promote the brand.
So my guess is that Richie is not in Japan, at least not yet.