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

https://charlottessuperjournals.tearosediner.net/is-pachinko-low-stakes-or-can-you-lose-a-lot-exploring-japan-s-unique-gambling-landscape

Gambling in Japan is a curious mix of strict laws and surprising exceptions. Most forms are illegal, yet you’ll find popular venues like pachinko parlours and legal betting on horse racing, keirin (cycling), and kyoutei (boat racing)