Gambling in Japan is a curious mix of strict rules and quirky exceptions. While...

https://ace-wiki.win/index.php/How_to_Bet_on_Horse_Racing_in_Japan_as_a_Foreigner

Gambling in Japan is a curious mix of strict rules and quirky exceptions. While most forms are illegal, a handful of games like pachinko, horse racing, and keirin (bicycle racing) offer legal ways to place bets