Trickery
The only way to get a horse into a library is through trickery. Horses aren't big readers, so you'll need to trick one if you want to get it to go to the library with you.
へん
だま, かた
None
The reason you love trickery is that it makes you feel like da man (だま) whenever you successfully trick someone (even if that someone is a horse).
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.