Prune
Take your greatest treasure, hold a knife nice and close to it, and prune away all the weak and dead bits.
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Currently, you want to prune your greatest treasure: your car (か). Your car is made of wood, and it keeps trying to grow new buds and branches, so you have to prune them off.
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.