'This is how, one morning, the world began . in the fury of the elements that the gods themselves couldn't contain'. Pretty, intelligent and combatively courageous, Yoko Tsuno is an electronics engineer who always remains faithful to herself, never forgetting values such as loyalty, friendship and respect for life. In this adventure . There is a volcano in Bali, the Agung, called 'The Morning of the World' by the locals. And that's where Yoko meets up with her cousin Monya - who couldn't resist the temptation to use her time machine again. Her meddling with the past has caused a sacred dancer to be sentenced to death. To save the young woman and make things right, Yoko will have to travel back to 1350 AD and face the terrifying flying demons of the Agung.