This game is still in development. You can pre-order it now, and play it when it comes out, or you can wait to buy (though the prices on games like this sometimes go up a bit after release, so I personally decided to buy it early).
If you wanted early access to what's currently available, you can pay extra for the beta access. Currently only the character Moocha's route is complete for beta, and you can play all the way to the end with him, but no others, so if you don't like uncompleted games, it might be better for you to wait.
If you're looking for a completed game though, I'd recommend looking at their other game, Seiyuu Danshi. That's how I found this one.
Have a nice day. :)