Amazing toy with low price to enjoy holography! Using smartphone, as the size of it. More details, here the maker's web site "What is HOKOVISION" and compatible smartphones.
If this is the first time to buy from Rakuten Global refer http://domoarigatojapan.weebly.com/blog/how-to-use-rakuten-global-service But maybe not needed because it's easy to do.
To help you to buy stuff direct from Japan through Japan's largest and well known online shop Rakuten and amazon.jp