Gambling in Japan is a curious mix of strict rules and surprising loopholes....

https://magic-wiki.win/index.php/What_Are_the_Main_Legal_Gambling_Exceptions_in_Japan%3F

Gambling in Japan is a curious mix of strict rules and surprising loopholes. While most betting is illegal, you’ll find legal thrills in places like pachinko parlours, horse racing tracks, and keirin cycling events