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

https://reliabless.com/what-is-the-easiest-legal-bet-to-place-in-japan-with-little-japanese/

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