KONAMI release on December 15, 2016 the paid version of the Jikkyou Powerful Pro Baseball Heroes on Nintendo 3DS in Japan not just the free to play version.
According to KONAMI the official DEMO version of the paid edition game release on November 30, 2016 in the Japan Nintendo eShop what you can download and try it for free, but the details (limitations, save data file move etc) will be published later.

KONAMI with the DEMO version release announcement also published the latest promotion video of the game what you can watch in here! Stay tuned for more information!