Island Of Treasures

Chibiusa reads about a historical attraction in Japan called Kimi Iwasaki in her mother's research notes.
When the girls arrive there, they spy a man with a treasure map. They tail him all the way to Azabujuban overhearing him mumbling about the treasure map's word puzzles. The man, whose name is Lupin III, happens to be on a treasure hunt in order to obtain some money from his girlfriend.
Chibiusa decides to help him for a fee and they all pitch in to solve the puzzles. The treasure hunt takes them all over the country and it makes them all appreciate the wonderful attractions of Japan.