Two kids hailed from different countries, their nations often at odds, leaving their only moments together in school, making the wait for their next meeting all the more difficult.

They often find themselves in a playful rivalry, each hoping their letter will be the first to find its way into eager hands.

When the kids grow up, they both worked hard to fulfill their dreams, one became a pilot, one sail aboard on a battleship. They never halt the tradition - letter folded into boats and ships.

However, one day, their countries announced war against each other, each forced back to their own countries to join the military.

Before they are sent to the frontline, they left their one last messages, one brought by the angry wave, one lifted by gusting wind...Their journey then begins...