The world became much colder in the Northern Hemisphere. In just a few centuries, countries became icier and snowier in this new landscape.
Meet Jaroslav Chevak. He's a courier in this Arctic town. On one day, he was hired to deliver a mysterious package several miles away across the desolate blizzard-laden landscape. Jaroslav and his sentient hovercraft Yukihime have to brave the elements and other dangers to make sure the package is delivered on time.