Together
The card game fish are best at is blackjack because they can easily hold the cards with their fins together. In blackjack you don't have to have a huge hand, full of cards. It's just a few, so fish fins can keep them together and just hit or stay.
Imagine a fish trying to hold a full hand of cards together. Impossible! Fish don’t have fingers to keep them spread properly. Now imagine a fish trying to hold two cards together and nodding to hit. It's much easier to keep things together this way!
きょう
とも
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Once a year trillions of fish get together in きょうと to play blackjack. They have a huge tournament there once a year.
Imagine a bunch of fish gathering together in きょうと to participate in this blackjack tournament. With so many fish all together in one place, it probably smells pretty fishy.