In the Vertical World, where it’s necessary to climb all the time, young Mowz one day finds the legend of the Upland.
This lush world located far above him is full of water and food, but most of all, it is horizontal : one just needs to walk in order to go somewhere !
Though no one has ever been able to check the truth of this story, Mowz is determined : when he’ll grow up, he’ll become the first climber of the Vertical World to ever reach the Upland !
But sometimes in life, things take more time than expected…
60 years later, he’s still pursuing his goal despite doubt and despair. Until the day he meets a young teenager who will shake up his life.
Will they ever get to the Upland… ?