Hear
If you go up to a gate and press your ear to it, you'll hear what's going on on the other side. The people on the other side will have no idea you can hear their conversation.
ぶん, もん
き
None
From the other side of the gate, you hear one of the people start to play a song on a recorder. You recognize the song as "Hot Cross Buns (ぶん)." You haven't heard this song since grade school. "Hot cross buns, hot cross buns~"
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.