Marvelous did a special price cut on the digital version Rune Factory 4 in Japan on August 17, 2016 today. With the new price you can buy the game with 50% OFF until September 7, 2016 which means the game now available for 2685 Yen (with tax).
The original price is 5369 Yen (with tax) and this special price at the moment available only in Japan.