Island friends

Exploration Stage: Crystals
From: Detective
Description: The shadow city phenomenon has also been witnessed on an island in the Pacific Ocean. It is possible that collectors have been in contact with people from this island nation. Let us examine its authenticity!
Completed: Fill in the blanks to complete the picture of a whale in this Japanese crossword puzzle! There's also a numeric cipher on it! Type this in and wait for a reply from your collector friend! There's a chance they're living in Japan together.