Presents
You put on the shellfish mask once per year and break into people's beach houses, leaving behind presents.
ぞう
おく
None
The "presents" you leave? They are actually just zombies (ぞう). You leave zombies in people's houses.
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.