Pachinko parlours are places to gamble. You use a tiny aluminium balls and play the game, the more balls you get, the more money you will make. If you win, you can change them to things they display such as bags, cigarettes, snacks etc. If you want cash, it is illegal to receive so they will give you pens and you go to a certain place near the parlour and you exchange them to money.
A little weird law..
パチンコ屋はギャンブルの場所で小さなアルミの玉で遊びます。玉が多く出ればお金が増えます。
勝つとバッグ、タバコ、お菓子等と交換出来て現金が欲しい場合はそのまま貰うと違法になるのでペンをくれます。そのペンを近くの交換所で現金と変えます。
少し変わった法律です。