Ok so say I write a book and then I charge you the book price not once but for every page I write. I then every now and again give you a sneak paragraph teaser. You give the paragraph to your friends. Can I be mad. No. Because if people pirate my book as I am writing it, in the end they can still but it for the one price of the book.
When LP finally get around to finishing the VN I will pay the one month price for the game. Whether I pay once or every month, I will get the full content at the end.
And this will get additionally complicated when he tries to put this on Steam. Good luck with that.