Ryu Ga Gotoku Studio has teamed up with Line. a Skype like system for PC and mobile devices that allows you to purchase stamps to use in your conversations. Think of it how Facebook’s chat works on mobile devices allowing you to buy sticker packs. Same concept.

The Line software does seem to be available worldwide but there is no mention if you are able to buy these stamp packs outside of Japan. Although, with the way the website is laid out it may be all one system.

There are 40 sets of Ryu Ga Gotoku stamps all of which cost 170 Yen per pack.

Edit: The pack should be released on 25/07/2013 which is technically today in Japan so it should be available soon.