Nippon Ichi in Japan started the new Holiday Sale of the company with selected PlayStation games in the Japan PSN.
Between December 26 and January 9, 2017 you can buy selected NIS games with up to 35% OFF from the Japan PSN.

On the list you can find PlayStation 4, 3, Vita and even some PSP games but don’t forget the special prices are available only for the digital version games.
The exactly list can be found in here: http://nippon1.jp/psstore_contents/2016_newyear_sale/

During the holiday you can also buy new Disgaea PS Vita themes for only 300 Yen (with tax) and set of Avatars from the Disgaea 3 for PS4 for only 50 Yen / avatar price.