Basically a Card Case that fits 100 cards and 80 KC style Card Sleeves are on sale for 1080 Yen. Along with a single seperate.

They’re on sale until February 14th, 2016.

It can’t be canceled once ordered and you need a Konami ID to order.

As well, this is on order from Konami Style, Konami’s exclusive online store. Which is 100% in Japanese.

Source