In the year 2050, Derrida Yvain, son of the DZ automaton inventor Jacques Yvain, and his friend Nathan Bilstein discover a bug in the DZ operating system. He reports it to his boss Hans Andrei demanding a recall, but Andrei refuses to take action. Derrida decides to discuss this matter with his father the next day so that he can be on-time to Nathan's daughter Mage Bilstein's birthday party...