Overwhelming presence, fame, and status these are the traits that many used to describe the legendary Olaf, the Greatest Adventurer. Through Olaf's books, Dilo has embarked on a quest to uncover the mystery of where Olaf hid his most valuable discoveries. Using a combination of specific words from Olaf's writings, Dilo solves a long-standing puzzle set by Olaf himself. Now, guided by the clues, Dilo sets sail toward the island of Gekkajima, where Olaf is said to have hidden his so-called treasure.