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You've made yourself a tree bookshelf (that is, a bookshelf cut into a tree), so you build a fence to keep the riffraff out.
さく
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On your fence, you hang up a sack (さく) to accept donations.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up whatever 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.