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

https://mike-wiki.win/index.php/Do_Pachinko_Parlours_Feel_Like_Arcades_or_Casinos%3F_A_Deep_Dive_into_Tokyo_Gaming_Culture

Gambling in Japan is a curious mix of strict laws and surprising exceptions. While most betting is illegal, you’ll find legal outlets like pachinko parlours, horse racing, keirin cycling, and kyoutei boat racing