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

https://wiki-spirit.win/index.php/What_Is_the_Difference_Between_Toto_and_Normal_Sports_Betting_in_Japan%3F

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