SNK started the Spring Sale in Japan with THE KING OF FIGHTERS XIV PS4 game. From today until April 20, 2017 you can buy the game with 60% OFF from the Japan PSN which means the current special price is 3110 Yen (with tax). But for this discount rate you have to be a PS Plus user.
Without a PS Plus subscription you will get the game with 50% OFF and with that the price is 3888 Yen (with tax).
It should be noted that the package version also available with 49% OFF on the Japan Amazon for 4000 Yen (with tax): https://www.amazon.co.jp/THE-KING-OF-FIGHTERS-XIV/dp/B01ESIWBX8/