Gambling in Japan is a curious mix of strict laws and surprising legal...

https://future-wiki.win/index.php/What_Gambling_Can_Tourists_Do_in_Japan_Legally%3F

Gambling in Japan is a curious mix of strict laws and surprising legal loopholes. While most forms of betting are banned, a few exceptions thrive, like pachinko parlours, horse racing, keirin cycling, and kyoutei boat racing