Fable based on Martin Baltscheit's eponymous novel and play. By chance, a wild boar and a fox witness the birth of a female mayfly. They both take a liking to the merry fly, and thus don't dare to tell her that she only has one day to live. Instead, they pretend that the fox is the one who will die att the end of the day. This in turn moves the sensitive fly, who then decides to do everything she can to make it a perfect last day for the fox.