You can download the demo and check if it works with your PC. If it runs well, full version will run okay as well.
If you're asking if the full game will be free, I would say no. I'm guessing the purchase price will be similar to this dev's previous game, Seiyuu Danshi, which was about $33 USD.
However, as someone who's played Seiyuu Danshi and the Demo for Banana Ranch, I can tell you with 100% confidence that the purchase price is WORTH IT! You get a LOT of quality content, MANY hours of gameplay, and the games themselves have high replay value :D