Gambling in Japan is a curious blend of strict laws and quirky exceptions....

https://www.bookmark-belt.win/gambling-in-japan-is-a-curious-puzzle-for-travellers-while-most-betting-is-1

Gambling in Japan is a curious blend of strict laws and quirky exceptions. While most forms of betting are illegal, games like pachinko, horse racing, keirin cycling, and kyoutei boat racing are allowed under specific rules