One day, a curious little girl stumbles across a lonely little leaf, hiding in her attic. The pair quickly become friends, and set off on a journey to the end of the world. They build a boat, and sail down winding rivers, gushing waterfalls, and vast seas. Our two explorers face many challenges and obstacles along the way, but although they may be small in size, together they find courage they need to survive their voyage. This is the story of how the unlikeliest of friendships can lead to the most extraordinary of adventures.