Instructions, Mind you I can't speak/read Japanese I can understand how to work this...
This is for Vol 1, Haven't checked 2/3 yet...
When you finally get into the 'Game' you are presented with three types of tickets. The first is an outright win. You pick a 'Horse' who will win. Next is First/Second, you pick two horses, either can come first or second but they both must place in one of those positions to win. The last is First - Second, you pick two horses but they must come in First and Second respectfully...
When you pick the ticket you want, you then choose your horse, do so by picking one of the numbers 1-8 down bottom, holding your mouse over the horse image will give a drop box of info, but naturally we non Japanese speakers don't know whats there, when you have picked the horse you click on the pink box down the bottom under the horses image, if you can understand Hirigana, the one that starts with Kono.
You will then be asked to place the amount you wish to put against that horse. The page reads as such, 1: Horse number, 2: Odds, 3: The amount to be bet, 4: Possible winnings... When done press on OK button, if you change your mind on which horse, press the button on the left...
The next page now asks you if you wish to make another bet, the left will go back to the Ticket choice while the right will start the race...
EDIT:: Oddly enough I bet on Horse number two (Pink Pheromone) with all my cash. She won, after stripping to her Bikini...