A horse and a shrimp are sitting next to each other. They are both at the train station, waiting for a train to come and take them home.
The train pulls into the station. They walk up to the train doors, but they don't open. "Perhaps a key (えき) would help?" asks the station master, as he goes over to open the door to the train.
Currently there are no similar looking kanji which exist in the WaniKani learning system