Buy
Here's a net full of of shellfish that you can buy. You can't just buy loose shellfish. You can only buy the ones that are in the net, bagged up and ready for your money.
ばい
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You decide to buy as many shellfish as you can fit in your car (か). You keep buying until your car is completely full of shellfish before you stop. Cars are totally a realistic unit of measure.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up what ever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.