Rune Factory: Tides of Destiny

Aden and Sonja, two people who have known each other their entire lives, live a peaceful life on Fenith Island until they are struck by a mysterious curse. When they come to, they discover that both of their souls are now bound to the same body.
In addition to this unprecedented catastrophe, they found that the Faith Island they were familiar with had been replaced with a mysterious island that was inhabited by people they did not recognize. Exploring this new realm is the only way for them to save their beloved island and unravel the mystery behind the curse that has been placed upon it.
During the course of their adventure, Aden and Sonja will get assistance from an eclectic group of individuals and will also be entrusted with the control of a gigantic golem named Ymir. They will travel across wide seas with the assistance of their newfound big buddy, find hidden islands and dungeons filled with treasure, and fight terrifying monsters from the depths of the ocean!