Revolve
If your car runs into a cloud you'll revolve around it instead of going straight through. Clouds are really hard to see through, so even though you're trying not to, you revolve in a tight circle up and around the cloud anyway.
てん
ころ
None
You have to revolve around the cloud ten (てん) times before it disappears and you're able to go through.
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.